I don't think it's likely that the shift lasts too long, because it would be way too cheap. I think it's much more likely that it happens very quickly, so you have to notice and react right away, and then shifts right back.
I like that Sakurai wasn't exaggerating when he said that we might see some ATs that only the most dedicated fans would recognize, and I like that they can have some really insane effects. Keep these crazy updates coming!