I don't see it happening. Too much working against it, I think. Hollywood folks might think nobody cares about Canadian heroes. Plus, it's tough to have a superhero team movie, since Hollywood will insist on starting with the origins of the characters. It was doable with the Fantastic Four because they all got their powers at the same time. It was doable with the X-Men, because they're all mutants, so you don't really need to explain the origin of each individual character. It was possible with the Avengers because each character had their own movies first, and the Avengers movie was a sequel to those, in a sense. With Alpha Flight, they're not all mutants, and I don't see all of them getting their own movies. There's also the percepction that they're X-Men clones.

By the way, that is a nice list in the link. I'd go see any of them. Add the Legion of Super-Heroes to my list of "I'd love to see a movie, but it's never going to happen" movies.