Re: Should I stay?
Sounds very similar like something, that happened right here. A high ranking Aikidoka left. There's been a lot going on in the background, that was not ok, and which is the reason I left his class around xmas time. I do not want to go further into this story, as with me leaving his class, it's done and dusted for me.
Independant of this, it is nice to see loyalty to an instructor. But I would give the new instructor a chance too. There may have been things happening in the background you are unaware of, that need time to cool down. Give it a few months and see, how it develops.