Bring back older C&C, make tiberium sun of today with walls and firestorm generators and everything that made C&C gr8 the base building abilities.
I loved Tiberium Sun for base building yet as it progressed that was lost you cant make walls or lay path which i think ruins the gameplay GDI just has a steam roller feel as that's all you can really do and i think that stops real turtling. Also i think the stile people now play GDI makes playing as nod much the same you don't really use guerrilla warfare which is what I thought nod was about. I know this is a fundamental game idea so its hard to really add great description into how the game should be but i hope people may read this and remember the great games we used to play and how today games made under the same franchise seem to be completely different games i.e. diablo 3 which took away a lot of character customization so all characters are now generic and your only advantage is gear. For me i enjoyed tiberium wars but it wasn't adding features to tiberium sun it only took away.
Pros- Making a strategy game have STRATEGY not just learning how to steam roll opponents.
Putting back game-play features that weren't added upon only taken away or replaced.
Cons- eeerrrrrrrrmmmmmmm. . . . . game producers having to learn the franchise they are trying to make and doing real work by actually ADDING new features instead of essentially making a new game that seems similar and slapping an old name on it.