I would keep everything but saves on the server side and just process mouse clicks. But to re-make the engine in those technologies would require much much much coding. Or even mucher! Or even the muchest!
EDIT:
and seriously...It's much better to just run the game on the server and send the rendered frames to the user just like microsoft and others are planning to do lately.
EDIT:
and seriously...It's much better to just run the game on the server and send the rendered frames to the user just like microsoft and others are planning to do lately.