I wouldn't be surprised if at least a couple of them have done anime OP/ED songs but maybe just...this is what is popular with young kids these days and us 30+ year olds are the ones complaining...sigh...actually, even for concerts, sometimes awesome bands like Obituary and Nile are maybe only 60% full lately, but a band like BFMV is sold out within days after announcement...I thought metalcore would become more popular here but for some reason it is still only so so popular...punk is more popular by far right now, which is probably why even Ozzfest has a few punk-ish bands playing.