I believe both Bitcoin and its clones will fail to reach mainstream acceptance because they have a serious economic flaw, which is that deflation severely hurts investment and borrowing. I think a deflationary currency with demurrage will have better luck at stimulating economic growth.
There is no such thing as a deflationary crypto-currency, anyone can create more of them. I don't see people going for a currency with demurrage realistically, I can see the deer in the headlights look already trying to explain that to the average person.
Creating clones of a currency doesn't make the original non-deflationary as they are not part of the same network.
The effect of demurrage on people's purchasing power is basically the same as inflation so I don't see why they wouldn't be able to accept it.