Its kind of hard to say how well the Hasbro Legends are doing, since the first wave has a somewhat iffy lineup. Even if they were all outstanding figures, quite a few of them are kind of "niche" type characters. Planet Hulk is storyline specific (and we already have several Hulks), Ultimate Iron Man is obviously from that universe, and if you don't like that universe you probably won't pick it up. Beast is a movie figure, which leave Banshee, Emma Frost, and Hercules. Hercules is the only one I picked up from this wave. I was tempted to get Emma to complete the Astonishing X-Men lineup, but just can't bring myself to pick it up. I was tempted to get Banshee as well, since he is a "classic" X-man, but again, I haven't brought myself to do it. HML2 does look much better, so we'll see.
Honestly, it wouldn't surprise me if Marvel Legends didn't get a lot of attention this year. Looking at Hasbro's year, they're going to really be packing the toy aisle with 30th Anniversary Star Wars stuff, 25th Joe stuff, Transformers movie, Spider-Man 3, and Fantastic Four 2. That's a lot of stuff that's getting more "mainstream" looks this year, so Legends might be on the backburner a little bit.
Like many people have said, anything new is pretty much gravy at this point, because we've had a heck of a run through ToyBiz (and Hasbro). If Legends really is starting to struggle (due to character selection, price increases, or product differences), I could see them packing it in - or switching to the 5" scale. They mainly got the license for the movie properties most likely, and Legends is kind of gravy for them as well. It came in as a strong collector line, and we'll see what they do with it. Switching to a 5" scale would allow them to "start from scratch" and do their own versions of all the big guns that we've already seen several times. Its likely not many of us here would be interested if they did that, but try telling them that. I was thinking about this, are Legends and DC Superheroes the only true mass market 6" scale action figure lines (not statues) at this point? Star Wars, Joe, Pirates, and now for the most part comic movie figures (Spidey, F4, Batman, Superman) are all smaller. I believe stuff like Turtles and Power Rangers are as well, but I'm not as familiar with those. With the oil prices, maybe smaller scales are the way of the future. I guess it is ok, since we've gotten such a good selection of characters already. There will always be a few I wouldn't mind seeing, so hopefully we'll see a little more in the future.