Why don't they just to redo C&C TD and C&C TS on a new engine with the latest graphics?
They could even keep the missions roughly the same because let's face it most people play these games for the multiplayer nowadays!
I really don't see why they need any original Westwood developers to make it. It's not rocket science. All they need is a few developers that loved the C&C genre and they will surely do it good justice in a remake.
Generals wasn't C&C IMO. No tiberium = no C&C.
Likewise, no annoying bugs like the tiberium harvesters randomly stopping or getting blocked by a tree on their way back to base = no C&C. These bugs must be preserved in any remake!