Main Scenario Quests: Alternative for Completing Dungeons?

I was wondering if SE will ever implement a one-time only solo version of the dungeons required for the MSQ?
I don't mean for newer expansions/dungeons, but specifically for the dungeons pre-50.
Perhaps exclude the Primal battles, as those can be completed rather quickly (even though the queue time may be more painful for DPS later?).
As stated in my first sentence, make them ONE TIME ONLY
Also, make them available only when you have the appropriate quest active.

I play on off hours and don't know many that play when I do.
I don't want this option "because SE should cater to me, me, me!".
Many people may prefer to do a solo version for the sake of various reasons, and I'm not asking for Heavensward MSQ dungeons to have solo versions.

I think it is good as it is.
I think it works like that if you have to do an dungeon or trial because of MSQ you get putted in front of the queue for that dungeon/trial, so should be fast to get in.

I thought they added people who need to clear something for the first time are given higher priority with Duty Roulettes in the expansion. Even if you play on off peak hours of your server, if it's for a first time clear like for main story quest, you should get into the dungeon faster than other people that are doing it to level/do their dailies.

I don't know about Heavensward MSQ dungeons, but I did wait for 20 minutes as a DPS the other night, on one of the level 49 or 50 MSQ dungeons.
That is, until a kind soul tanked for me.
Another trial, I was waiting another 15 minutes.
Both of these wait times were for the one boss/area trials for the "Operation Archon" MSQs.
I watched the tank and healer spots fill, empty, fill and empty again several times, so I doubt DPSers are given any priority when they queue for MSQ dungeons the first time (at least for the ARR MSQ dungeons I queued as DPS for) (this is just an observation!).

I would like to keep queuing as DPS as I catch up on the MSQ, but these wait times are monstrous.
It should be an OPTIONAL alternative, of course.
And players will have other reasons they want to solo the MSQ dungeon, not just because of the DPS wait time (or maybe they don't feel comfortable tanking/healing yet, but that's the only role they can fill at the time).

20 minute and 15 minute wait times aren't really that bad. If you can only play 1 hour each day, you can basically clear 1 instance each day you can play (20 min queue, 25-30 minute dungeon). There are 21 dungeons/trials that need to be done in 2.X main story. That's not that bad for a casual player really.

You can turn on settings to make the sounds of the game play even when it's not in focus, so you can alt tab and do other stuff. Or even turn on speakers and go do real life stuff while you listen out for the dungeon pop sound.

Wait till you have 45 - 60 minute wait times for non MSQ content, or worse time out completely... twice.