Why is there no reason to have the same people in it, it would help make it feel like the same franchise at least. They should just do another alien invasion film if there no real connection. Its not like the original story was so great it can be built upon, it was just an entertaining film.
I agree with above poster and also think the idea is kak, so the humans are ready for them now then? The great thing about the first one was that it was a surprise attack. The humans still came out on top, with better tech it would easier so less tension and a crap stale mate scenario until the humans inevitably win.
Bringing this film back after so long has got tird written all over it. It probably wont even happen