The large age difference between them and different levels of experience, etc., always made this a real possibility, but this is very odd timing with the GP starting in just 2 months, and of course the Olympics in less than 2 years. Mary Beth quitting abruptly like this with no reason at all given in the press release (not even a "I want to focus on school" reason like Keauna gave) is quite strange. Perhaps she was thinking about this for a while and couldn't take it any longer, or maybe there was some sort of emergency situation. It's a shame.
I feel for Rockne, because he's 5'8", and finding him a 5'0 and under Sr level pairs partner this close to the Olympics will be ridiculously difficult.