Leslie - that has been a topic around here quite a bit over the past year, though more in the context of doing so during open-ended traveling (which obviously gets in the way of developing a long-term connection with students). But if you're live-aboard, why not? My biggest concerns would be technical (temperature and humidity variations), though those mostly go away with a decent digital. I have the Roland RD-700SX shown in the photo
below, though that's a bit much to take aboard as I have no place to leave it permanently set up... more likely, I'll use a much more portable Casio 88-key Privia or an M-Audio ProKeys 88, and let the Mac take care of synthesis.
I'm just an "adult beginner" but discussed this quite a bit with my teacher. We came to the conclusion that it would be do-able as noted above if staying in one place, or if cruising by shifting the focus to workshops such as specific pieces, refreshers, consultations, and other "short" exchanges. There might also be some real opportunity to take a small group on an intensive "piano cruise
A great place to get opinions from teachers about this would be over on the Pianoworld forums
- delightful and friendly bunch there with a lot of serious expertise.
Cheers from up the coast,