Well the socialists have already made statements that they would rally around some boycotted performers. There are some on the left who feel it is their duty now to buy a Dixie Chicks album even though they don't like the music. Sales are sales. The question is: Are the useful idiots who will follow marching orders and buy merchandise that they will never use a less significant part of the economy than those former customers who were outraged by the actions of the celebrities?
The Hollywood Weasels have put themselves into a niche market. For some, they were second stringers or has beens already; any press is more than they were getting. Others may find the phone ringing less and less. Those wannabes can always collect a speaking engagement fee (the Blame American First agitprop business has been good since the second half of the Clinton reign (with the WTO protestors, et al)).