I can't imagine that Frank didn't discuss his move with all of his students. As many pointed out, Lake Arrowhead is not convenient; so, many families might be willing to move, too, or they will stay and work with other coaches that have benefited by working with Frank.
Michele and Karen Kwan stayed at Lake Arrowhead when they trained with Frank and one or both parents drove there daily to check in with them. I think they had a restaurant, too.
Once a restaurant is established, it is possible for the owners to hire a good manager and be there for only part of the day. So, it's possible that all the Nagasu's will move somewhere between the rink and restaurant.