Just like the banks were too big to fail, Qt is "too good to die". You might not see a corporate overlord the size of Nokia again, but I'd say that for many reasons, that might not be a bad thing.

There are a large number of people (and that number is growing) who are not paid by Nokia to work on Qt (disclaimer: I'm one of them). If you look at qtbase (where those numbers are the highest), then Nokia contributions account for around 60% of the total activity. This isn't so much because Qt development has been slowing down (though it has lately, with the push towards 5.0 release), but because a lot of other people have been pushing their work forward.



Take a look at the other stats on http://www.macieira.org/blog/qt-stats/.

tl;dr, don't worry, everything will be fine, thanks to Jolla, and other companies/individuals interested in the future of Qt. But by all means, come contribute.