Qt is open source, kiddos. If you want something done quickly, do it yourself.
That is very naive to say.
If I take what you say to the extreme (to make my point) then we wouldn't need the trolls for making Qt in the first place, since we could have just implement Qt ourselves - which is of course nonsense.
Yes, we can implement some small features and changes, but its not like any of us is able to maintain a source base as Qt is - and when the problem is not being a top notch developer, then for the simple reason of not having the time, since we actually are working on implementing the applications we do - and we use Qt because it has implemented so much stuff for us, so we can focus on the application logic, and not about the low lever mechanics under it.
Qt got to be the quality tool it is, because a large number of paid excellent developers have worked on it in the last 15 years.
I don't think this can be expected from any non paid community.
Not having a serious company with commercial interest behind Qt will not kill it, but it will sure pull the breaks on its further development.