Surely this idea that the Boston/New England market will not sustain a Bruins rebuild is ridiculous. All the other major Boston teams have gone through periods of being horrible and gone on to thrive again. Bruins fans cannot be uniquely fickle, shallow and narrow-minded, can they? It's an extremely condescending and low opinion of the fanbase on the part of the owners, which perhaps should not be a surprise.
Yes if the franchise goes through a fallow period then attendances, merch sales and general interest will decline, and the Jacobs will make less money. But that's the way of it. They'll pull through and the sun will shine again sooner or later. If the Bruins do indeed face some sort of lengthy rebuilding or wilderness phase, they'll simply need to knuckle down, be patient and plan a way back to the pointy end. Whether or not the Jacobs would still want to be part of that, well that's up to them.