Proof ? I got report of Queue getting longer and queue remaining the same at the same rate in this forum. We don't have stats so I don't think we can use this as argument. Maybe the change was easy to do so they did it to please this ''minority'' ( again, stats ?) to keep the game somewhat full and relevant ? In my eyes, it is one of the most important thing to do for an FF game.
By your meaning, MSQ roulette or other roulette should have never existed in the first place. I would say then: if you want whatever you want, go get a PF like in old MMO where finding a group in front of dungeons was actually a real thing. I wouldn't mind personally as I miss the old time. But we all know were most of the MMO industry headed. It is statically good enough proof to understand SE decision to baby sit their players to follow the trend. SE did a compromise then by doing this change for newer player which is still in the right direction.
if really the queue is longer (again stats ?) because the majority does not queue anymore, the majority cannot consist of alts and noobs who wants to skip because they are part of the queue actually .... The majority would be the vets who think the time/reward ratio is not good enough for this roulette.
The problem lies in the reward as it was designed for vets to make them do old contents to help sprouts. Cutscenes were designed for sprouts to enjoy, not vets so it should not be taken away from them to please duty roulette vets. If they really need to change something, change it on the reward for vets, not on the content for sprouts. If you start complaining on the CSs being too long, how about also complaining about roulette leveling lvl 16 being too long too. Let skip it directly to the boss so we can get instant experience .... I mean I already did Sastacha more than 10 times, me mashing 2 buttons to clear the dungeon is not better than watching 20 min CSs.
TL;DR : Please change the rewards for Vets, don't touch the contents for sprout.