I've always wanted to see the old group work together again.
Toying with the idea: Considering "Team Symphonia" consist of completely new staff never related to tri-Ace's staff they are out. So it would be some long time tri-Ace staff working with "Team Destiny" on a potential 2D games. The 2D part is again awkward though since tri-Ace pretty much let go of all its 2D staff after VP1. Also with tri-Ace being so prolific in 3D development 2D wouldn't make that much sense. On the other hand in ToDr Team Destiny did tiny steps toward 3D while retaining their overall 2D approach. So what they probably could do is a ToDr-like remix of ToP with all new, hole-free story and a mix of 2D with VP2 like 3D, or something like that... eh. =P