The basic question a capitalist will ask him or her self, will be -"Would I rather incur the small effort and tiny cost of accepting and handling a high demurrage rate altcoin, or let these customers with the altcoins go to a competitor who will accept them?"
This question can be equivalent to "Do capitalists agree to pay taxes to fund unconditional income?" or "Do capitalists agree to keep wage the same but reduce working hours?". Demurrage is just another expense for capital owners along with taxes and wages.
Considering this fact and that many (probably most) CEOs and major shareholders are insane right-wingers, the answer is rather obvious!