It might be the prices, but I'm just not sure how much kids care about action figures in general that much anymore (at least not more than having a handful - and there are always exceptions). I would say the Avengers line has sold decently locally (and maybe will pick up even more now that the movie is such a colossal hit), but honestly, the role play stuff is what is sold out (or close) around here, while many of the figures still hang on. It may be a thing where they feel like they already have characters like Cap, IM, and Thor from the previous movie lines (which are still on pegs too at TRU or WM).
I was looking over the pics at GH of that upcoming Bespin BP. Now, not necessarily taking CW into consideration here (not saying I want it to go away though), but if Hasbro does want to have a line for "kids" with the movie releases, I think they might want to go this way with the figures. That's if - and only if - the price goes down fairly significantly due to the reduction in articulation, etc. Also, if they keep a Vintage or Vintage-esque line for collectors. Cut back on the releases, and have a modestly sized collector's line each year (probably at the continued $8-10 prices or more), then in the "movie heroes" slot have this line of nicely sculpted but more basic action figures, and charge closer to six.
I don't know if anyone here is familiar with them, but our nephews (and now our daughter to some extent) enjoys the cartoon Ben 10 - and have some of the figures. After picking some of these up for Jayma, they run between $6-7, are fairly basic as far as articulation goes, but are nice solid "toys" that kids seem to like (they seem to sell like crazy locally anyways). Maybe price is what really keeps kids/parents away from SW these days. If we think $10 is too much for an action figure (and we're a tad obsessive about these things), what is an average consumer, or parent, going to think when they see that?