After buying bf3 and feeling so dissapointed in general, specially for not having mod comunity support, here are some ideas you can take from my experience, to make a better game, I know there is a lot of potential:
Delete or replace supression
Delete 3d spotting in non hardcore gametipes
Balance IRNV back properly, now its useless
Exporting IRNV coop reticle with chevrons and some zoom to DMR and bolt action sniper rifles
Body dismemberment! More and propper gore.
Fix head glitching
In game Voip (TS, RC and Sk constantly crashes)
Add Iranian models for multiplayer (There are on singleplayer crapaign)
Add more vehicles and weapons from sp too, like more jets specially the 2 seat ones, m95, more russian/us models that are in the folders indeed
Add dinosaurs! (with the engine animations)
Bolts 1 shot 1 kill to head at any distance, or bleed to death like Red Orchestra 2
Improve stability of the game
Use a propper forum like this
Never have to use battlelog again, its horrible
Teach EA and DICE a lesson for not hearing their customers and not giving propper support.
Well, those are some of my ideas for any future, the goal is to make a list between us all, making a real list