Also. There isn't really any loss in third party people using their time to develop 3D plugins.
Absolutely this... Scirra will not lose any time developing their stuff, the community works on their plugins that scirra can concentrate on the important part (C2 itself, basic plugins, more advanced plugins like Multiplayer, ...).
I have good use for 3D Possibilities in my apps and look forward to see an easy way to import 3D Models into my apps