Corporate changes as in:
Hasbro starting their own channel and wanting to have a Transformers show as it's flagship. T:FA was 3 seasons old, and had rights tied up with Cartoon Network. So, it was kind of disqualified from the flagship of the Hub role.
Similarly, Spectacular Spider-Man was a rights mess, having gotten caught up in the end of Kids WB/CW and eventually getting dumped onto Cartoon Network. But it was still a Marvel show made by/with Warner Bros, and with Disney now owning Marvel, in large part to put programming on Disney XD (Their "teen boys" channel), it too got the chop. (CN's long held plans to have more DC stuff likely explains their shabby treatment of SSM as well).
WatXM is a bit different. It had a long problem getting placed on American TV anyway, but it was concidered to be part of the same universe as Avengers:EMH (at least when EMH was being made early on). It, in theory could have continued (as Iron Man: Armored Adventures did) or moved to XD, but for whatever reason, they decided they finished the story.(Maybe execs at Disney didn't like it, there's some conspiracy theories that Marvel as a company works to tank the X-Men property because Fox has the movie rights). As there's now a comic with the WatXM name, they at least want the trademark kept. Maybe they want to go in another direction with the X-Men, should Avengers get third season
Edited by Scavgraphics, 08 March 2012 - 10:37 AM.