It's been about a decade since I played this so I could be wrong, but I'm pretty sure I remember some of the Aeons (Bahamut in particular) asking you to end the dream for them as they were tired of it. If I remember right the aeons were all part of that dream as well, so by them essentially asking for death it shows you at least some of them thought the same as Tidus. The sensor descriptions you can get from the aeons in your final fight with them pretty much confirms this as well. There's also this from the wikia: http://finalfantasy.wikia.com/wiki/Fayth

After growing tired of a millennium of dreaming, the fayth request Tidus, a person who hails from Dream Zanarkand and thus a product of their dream, to destroy Yu Yevon so they can rest. Bahamut's fayth knows Tidus from his trips to Dream Zanarkand, and due to the fayth's shared consciousness acts as a spokesperson for all the fayth in asking him to kill Yu Yevon to stop the summoning.

So I'd say that's a pretty good indicator that almost nobody wanted the dream zanarkand to keep on existing anymore, its residents included.

In terms of morally questionable things going in in FF X, I've always considered the big one to be Tidus basically saying "Screw the final summoning, we'll find some other way to stop Sin." Of course this is a videogame so everything works out that way, but what if it didn't? What if there really was no other way to stop Sin, and his actions basically caused all of Spira to continue suffering from Sin because Tidus didn't want to lose Yuna? That's always been an idea that interests me, because in the real world things rarely end up working out perfectly like they do in fantasy tales. What would be the consequences of a summoner just deciding they refuse to go through with it?

In Tales of Symphonia, which shares a surprising amount of parallels to this game (one world's existence causes another world to suffer, the church is basically corrupt, you need to go collect summons in order to "save the world" as it were, fufilling the chosen's journey will cause them to 'die') they mention one of their "chosen" (equivalent to a summoner in X) was basically forcibly dragged around to all the seals (which coincide with aeon temples in X) against their will in order to bring salvation to their declining world. Would Spira do something like this as well if there were no willing summoners? Would they just tie them up and drag them to each temple in order to obtain the aeons and save the world from Sin? I think it's a very interesting plot point that could spawn a lot of great fanfiction.