I haven't seen any idol anime, but I'd be willing to give it a chance. If nothing else it looks cute.
And sure but all the "trash" animus aren't stopping someone from making something different or "artsy" if they really want, any more than Call of Duty is stopping people from making different games or Transformers is stopping someone from making movies. If that kind of thing doesn't do well it simply means it wasn't what enough people wanted. Yeah there's stuff like SAO or Attack on Titan but there's also stuff like Stein's Gate or Evangelion, Mushishi, Ping Pong, Phsycho Pass. There's at least a couple shows every season that do something "different" that do at least decently well and considering you're working from a pool of only 30-40 that's pretty damn good.