The aliens were defeated. End of story
No sequels are necessary. If they need to do another ID movie, it should be a prequel showing how they kidnapped and probed Randy Quaid.
By a simple thing such a computer virus!!!! I'm sure if they had better bouncers on their doors they would have destroyed earth in the first movie!
I loved the first movie i think if Bill Pullman is back well then for me that's the only connection it needs! Will Smith is no major loss for it but i love the idea of a cliffhanger in the 2nd movie sounds epic looking forward to it!