Well, we were all under the impression that Ongaku Gatas was disbanded this entire time anyway, so if they were to fade away after this release I don't think it'd be too much of a blow XD
But MK were like, a ray of hope that somewhere the old H!P still lived on in a complete form. Sure all the old H!P members are "still around", doing TV stuff and the occasional release but none of them are in their original roots. MK has been the same since H!P's golden days, and through everything changing and groups reforming and all the graduations, they're the one untouched relic from the golden era that we had left
I think that alone makes this a lot harder to deal with!