I can't speak much to ColdFusion or WSDL though.
Of course since Adobe has all but abandoned the platform, it probably won't be much of an issue in the future... Kind of a shame, as Flex was actually pretty nice. If adobe was more open with the flash client as a platform, and focused on the tooling (where they make their money), it could have been integrated into browsers, and had a much better chance of sticking around.
It's a real shame, since the closed source aspect of Flash really led to a brain drain within the community. Flash for many years was the superior platform for making complex web applications, but sadly, it did not have the community and brain trust that more open standards did, like HTML and javascript did. In the long run, this led to serious stagnation with the platform.
[...] the value of types is super super important. [...] Everything that is syntacticly legal, that the compiler will accept, will eventually wind up in your code base and that's why I think that static typing is so valuable because it cuts down on what can kinda make it pass down there. I'm only getting stronger in my stands on static typing, static analysis.[...] - John Carmack, qcon keynote 2013
ActionScript 2 was a lot more like Javascript than ActionScript 3 is.