|War of the Worlds 2: The Next Wave|
is no doubt the worst mishandling of Wells story ever, i only advise people to watch it to know how NOT to make a movie.
But that said, a proper sequal for War of the Worlds story....
I personally think it should be something with something to say as Wells original book did back in the 1890's probably something involving maybe obliteration of the earth like a complete collapse of civilisation, but the ending involves the Martians and Humans having to put aside their hatred in order to work for a future on earth and to slowly rebuild the civilisation that was destroyed that the Humans had, and the Martians finding a place to live on Earth in peace with it's inhabitants, kind of a Gene Roddenberry sort of thing, but i know that Wells would probably find an idea like that appealing.
After all, the original Novel was witty, it's not a strong adaption if said adaption only cares about and focuses on the war explosions and violence, the Martians in H.G Wells Novel are not those of 50's B-grade movies.
They invaded Earth out of desperation after all efforts to remain on Mars failed, they did not express any real hatred for humans, only frustration at being hindered, but a plot involving the gulf between the Martians and the Humans would be something that i think would be necessary for any possible sequel.