What Happens After The Aliens Are Dead?

War of the Worlds was on yesterday. The aliens were killed by bacteria, or viruses, as they typically are. What comes after?

That wasn't all the Martians there are, surely. They must have had some idea what was happening to them and sent a warning back home. So will there be more Martians, prepared to try and protect themselves from pathogens? If they're smart enough to reach Earth, they have to be smart enough to come up with something that might protect them against diseases.

What about Earth? Will they concentrate on rebuilding, or would we see several wars of opportunity? Rulers of smaller nations that perhaps weren't hit as hard deciding this is their big chance to elevate their status. I suppose there'd be a race to reverse-engineer the Martians' technology, but would it be to use it against other Earthlings, or for a revenge strike against Mars? Maybe humanity would really surprise us and try to adapt it to something peaceful. I don't know what Martian tripods use as an energy source, but it's almost certainly an upgrade of the types of power plants we have.