I am surprised that people are surprised. On FSU people were speculating that Alysa would retire and go to college well before this announcement. For me, it seemed quite likely. I did expect the announcement to wait until the Fall (after the Star on Ice tour was over) but I did expect the announcement. I would have been more surprised if she continued.
I like the idea of her enrolling in Public school in order to have social experiences such as Prom and Homecoming, belonging to clubs, etc. I have no idea if she is interested in that but from her Instagram feed, I get the impression she'd enjoy it very much.