I use fusion for:
1. Combining render passes together and tweaking them,
2. Creating additional passes inside fusions 3d space based on the imported models from 3d application's, to reduce the time needed for getting the same result from 3d application,
3. Creating scenes from scratch modeling/rendering/animation/motiongraphics fully done in fusion
4. Creating animatics in very short time, fully in fusions 3d space, which is the fastest way to show a client approximate motion and composition.
5. Just having fun, because it's easy to use, gets job done and fun to watch how others can't understand node based workflow
So my request for near future is not the 3d or planar tracking, that will be always needed, but can be done in other softwares, but is the:
1. fully integration of great plugin krokodove
2. Better Grid Warp ( be able to create a grid around any shape, by painting it, and decrease or increase grid rows and size during animation, without loosing everything, maybe a button like in the sculpting software's? to get higher level to continue the work, without loosing previous layer's)
I tried to be realistic in request's. Hope there are already fun made solutions out there
Cheers!!!