I would think (hope) that based on their history, the current group will vet the new owner carefully. However, if what Cuban said is accurate, and the current franchise valuation only makes sense if there's real estate - i.e. a new arena - involved, then it gets really interesting.
There's not a lot of room to build an arena in the Boston area - along with retail, hotel etc - i.e. what Kraft has at Patriot Place.