There is, to be sure, a majority of their current market blissfully unaware of the boycott at all. These are people who never saw the Mulvany charade and are simply looking for cheap suds. If the new team can manage to drop the social manipulation and just sell beer they might have a chance, but it's going to take a while.
They'll have to sell the beer at a loss in order to get their customers back. Then raise the price gradually.