Honestly I don´t think so. Having WP7 as primary platform Nokia already noted that there is no place for QT on these devices. This makes it playground for Symbian and MeeGo only. Symbian is going down the sink anway and MeeGo is of no strategical value so investment into QT will be drastically reduced.
If at all the future of QT is not lying inside Nokia but outside. But this can not be done from a community only- QT has grown too large that a community can cover the whole framework. Especially not on all platforms. An existing community like KDE might focus on important parts of the framework but not without withdrawing resources from the main project.
The only solution to this dilemma I see is an investor who sponsors further development. Or a revitalization of TrollTech.

Otherwise I do not see a future for the framework as we know it.