I'm pretty sure it's a joke. Otherwise...what about the sentai clans? Do they get disbanded? Plus...sentai is the only way they can get a sneek peek of what to expect in PR. There's no way that sentai discussion there can be abolished completely. One day they'll eventually realize that you can't have one without the other. I threw a link to this place in that thread in case the disenfranchised want a new home. I'm pretty sure it's just an April Fools joke though.