I think this is something everyone on every faction could get behind... and a feature we could truly all get something out of us! Give us destructible trees, so that we may end the Fourth Faction nightmare. The trees could regrow, or re-appear like turrets with the cool grid thing! Make them strong, make them tough, but make them destructible! Who could say nay to this??
Make them burnable so that if someone crashes into a tree, there is a chance that it gets set on fire. Then give medics a bucket of water and fertilisers to put out the fire or make the tree regrow faster. Of course trees can also be set on fire by concentrated fire from explosies (or even some small arms such as.....all of vs weapons)
100% destructible environments with good graphics is going to be pretty common as the hardware and programming gets better. So go play some Red Faction or Minecraft for now. This game is already extremely heavy in many aspects as it is.