TL : DR = Remove casual/ranked, make it one mode just "Crystalline Conflict" and add Ranked decay to higher tiers probably aggressively so.
I was trying to do Ranked matches in CC and it has "More than 30m" wait time at around 11pm eastern, this is when I would usually try give or take an hour. Then I try to do Casual and it has "Less than 5m" and did in fact get a fast queue.
The game's PvP player base cannot sustain 2 separate modes, especially with how they've handled the Ranked system. This isn't a competitive game to begin with like Overwatch/etc where it's entire user base is playing the "same game".
The rewards are literally identical for both modes, except Ranked has the added bonus of the trophy crystal tiers. There is pretty much no actual reason to play Casual other than not having to worry about your rank which I don't even think is a real issue since the rank decay doesn't exist until resets. Or flip the logic and say there is no reason to play Ranked after the rewards are given out anyway since Trophy Crystal usage as stagnated on what's available. Which is another issue.
Some people will have the thought process of not caring about Ranked and never do it, so already that is a subset of players not available to queue. Then you will have another group of players who have already hit whatever rank they wanted so they no longer have a reason to play Ranked, this is a second subset of players that are now not available to queue. Then you will have a third subset of players, like myself, who will see the queue is "More than 30m" and say I'm not waiting that long and just try Casual instead and thus not have a Ranked queue.
It doesn't take much logic to realize Ranked CC is losing out on player queues because of all of the above. Whereas if there was only one single queue it wouldn't matter and everyone would be queued together properly and the "Ranked" aspect of it would just be attached regardless. Which should not even be named Ranked it should just be "Crystalline Conflict".
The one issue would be skill level matchmaking, which in my opinion already became a problem with the changes, and the Casual queue solves this by being a free for all at the cost of any sense of balance unless it's doing it on the backend anyway (which I doubt).
Previously in the first two seasons if you were Bronze you got queued with Bronze and Silver once you were near the rank up, and that mostly applied at least up to Gold, with Bronze-Silver, Silver-Gold, etc.
Now with the new matchmaking as Bronze you are queueing into Gold players which seems like such a large gap you just increased the RNG skill level of the teams. Before you were mostly on equal ground and maybe Silver were meant to carry. Now you have Gold players who are meant to carry Bronze and it's just feels so random.
My only guess is that this was meant to speed up the non-existent queues by expanding the range of ranked players. Now imagine if instead of only having the ranked queue, you had every single person who wanted to play CC in the queue so that those ranks were now expanded to more players.
You can keep the queue gap as three ranks if need be and then just do the closer rank queues if the CC player base can now sustain that if everyone is now together.
I do think there should also be a proper Ranked decay for the higher tiers. Given the fact that the seasons are relatively short compared to the series, they probably have to have a more aggressive decay in terms of time. The higher the tier the harder it should be to passively maintain.
The issue is that because there are more risers it would actually be harder to get demoted out of a rank because of decay. Crystal would be an entirely separate problem because of the credit. Some people have thousands of credit so if you were to aggressively balance the decay around them you would quickly get rid of the ones who got to Crystal and stopped, which maybe is a good thing.
If you did something like 500 credit decay per week, the season seems to roughly be 12 weeks and for most that would take them out of Crystal tier, there's only 1 person who would maintain it since their credit is 6700+. For everyone else once they hit that 0 threshold they would go back to Diamond 1 2 stars.
Then it would be a decision of how aggressively they want to do it. At 2 star decay per week it would take a full Diamond player roughly 10 weeks (almost the whole season) to demote into Platinum. If it was 3 star decay it would take 7 weeks. For a Platinum player it would take ~8 weeks at 2 stars to decay into Gold.
This would be if there were no banked days timer to have a buffer of not playing the game, which would be more generous. I don't really see how they could handle that without being MORE aggressive as in "1 star per day" if they were to opt for a banked days system. Yes it would mean people have to maintain their subscription if they wanted to maintain their rank which I'm sure people would hate. But the alternative is clearly not working.
Added Bonus: Put Crystalline Conflict in it's own Roulette to give other people more rewards for doing it.
TL : DR = Remove casual/ranked, make it one mode just "Crystalline Conflict" and add Ranked decay to higher tiers probably aggressively so.