A musician friend and I were just having this conversation the other night. He has stopped listening to the alternative stations in town because he doesn't like how "soft" they've become- as they play a lot of the bands like Fun., Grouplove, etc. He said he misses some of the harder music. I've started listening to alternative again because I like these group's sounds and I think alternative has sounded more fresh now than in any time over the past decade.
The point being- you're almost never going to please everyone- and since musical is cyclical, who knows how long this current trend of softer, folk and indie based bands will last.
What I don't understand, though, is people begrudging acts that end up on Hot AC or CHR or even country stations after their exposure at alternative. Shouldn't we, as alternative fans, be happy that this music is spreading as it helps to keep the music relevant? I heard Mumford & Sons on a country station the other day, and while it seemed a little odd, it bodes well for alternative that these acts are crossing over to formats that have the potential to draw new listeners to the alternative format.