He says that it'll challenge him, so it can't be that he's stepping down as a songwritter/composer for MM. Also, it doesn't mention H!P, so if he would be stepping down, it'd affect H!P as well
He says it could make a big effect on the group.
Challenge for the girls... So it means more work, or something harder, never/barely done. An international tour promoting the group and phones?
Maybe it's focusing on international fandom. The girls being abroad for a long time could annoy hardcore wotas, so that could be the "fans may not like it" part.
Maybe, semi-permanent/permanent subunits? Like Sakuragumi, etc? That's a greater challenge for all of them, and may annoy fans...
But a nation-wide campaign promoting their own branded phones, with new songs and the like could fill all those criterias, less events/concerts/handshakes because of this.
Also, a
joint promotion for those phones with another big idol group? (AKB or momoclo), that could piss some fans as well
Anyway, it's scary
I just hope it's nothing like a grad, or Tsunku leaving songwriting.