I suppose. But really, when was the last time you got Sastasha and saw a New Bonus? I don't think iv'e ever seen it. Altering the system to avoid dumping you and 3 other capped players into content no one needs would fix that. You would only ever do it if the Demand got really high, which would only happen during the Launch period when we get an influx of new players.
As to the mandatory story stuff for new players. Thats actually not a problem, and IMO, plays to the benefit of XIV, especially over WoW.
It has to do with story cohesion and giving new players content for what they paid.
WoW has a huge problem presently in that the world no longer makes any kind of sense. You have to buy 5 expansions to play WoD but you never see the content in those expansions because no one does it. Even leveling a new character through the affiliated zones, you get halfway through said expansions zones and hit the level break to go to the next expansion.
With XIV you get ARR base story/content, 2.1 - 2.55 story content, then you get into HW and you get all of the attendant patch content. Next expansion will keep adding new content for a new player to enjoy.
Yes, there will be players who don't care about the story and just want "to do raids". Unfortunate for them to be sure. But i don't think they're in the majority.
There are a LOT of early MSQs that is just fat padding. Heavensward cutdown on that a lot. But i don't think we need to start cutting Dungeons out of the MSQ. Especially as the reason behind the desire to cut them out is to benefit veteran players not wanting to do them than new players.
No offense intended at all, But if you do not wish to do that older content, you have the option to simply not do the Roulette's. They are not mandatory. A veteran player need never even look at Sastasha ever again. So there is little need to rejig progression for the lower levels.