Or are you just assuming that capital owners would be suspicious that somehow they're getting robbed, if a lot of other people are suddenly better off?
Corporations like Apple and Google have tons of cash in savings but nevertheless
dodge paying taxes even at the current tiny rates.
Do you really think capitalists will suddenly start sharing profits voluntary?!
Businesses can easily adapt to an altcoin with fast demurrage. They'll spend altcoins as fast as they can, of course, and when they acquire a surplus that they don't need to spend right away (i.e. a profit), they'll be able to exchange it for Bitcoins or dollars or some other currency for a small premium. When they need to spend more than they have on hand, they will be able to exchange their dollars for altcoins to gain back most of the premium they paid to get into dollars.
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?"
As long as there are fast, convenient and reliable online exchanges, I suspect they will take the business.
For that matter, it seems like any crypto-coin for crypto-coin exchange could be done completely with an online ask/offer/accept/trade protocol, with only the tiny transaction fees. No need for an intermediary exchange-for-fee business, as there is for converting to/from government currencies.