I agree with all but number one. I think there are a lot of unanswered questions that could be explored. I could see a plot line along the lines of, the transmode virus was not Dravis's creation, (after all, it was an alien virus) he was just a 'useful idiot' in the greater scheme of the aliens who are planing a hostile takeover of earth.
Atmospheric entry gives its own game issues (have you noticed in every videoclip the Pyro spawns next to a planet, not inside the planet's atmosphere? - maybe the warp mechanism has to avoid strong gravity pulls). Like having to do stealthy re-entries. Or being intercepted on entry/descent. More plot devices here.