About staling and personal issues, of course as a commercial unit you should pay attention to the complaining masses, but do not make it your priority, your personal life and well being should always come first.
About redrawing..
I personally liked some of the previous art more than the current style and character drawings, would it be possible to have a vote? I mean some of the "customers" may have started to follow and support this game with the previous style and by changing it you may/or may not change their opinion too.