It would be super awesome to have a real competitor to After Effects. I do use motion but something more like After Effects would be a winner, control over keyframe interpolation, masks, expressions and shapes!
I think there is a ton of improvement that can be make and the world would become a different place.
I have made the move over to Photo and Designer and feeling more comfortable with them everyday!
Now just a really cool motion graphics/compositing program would completely get rid of the need for Adobe for me.