Well the idea idea of cryptocurrency is here to stay.
Cryptocurrency is very convinient and secure.
The question is will it bitcoin?
I think the answer is yes because businesses like overstock.com and microsoft have already started accepting it and they probably don't feel like the minor changes other crypto currencies offer are worth the hassle of switching.
Accepting it is one thing, actually holding it in their cash reserves is another.
In most cases 'Accepting' just seems to mean autoconverting to dollars with bitpay - except for overstock which is actually claiming to hold some - are there any others?
It is a first step. Of course you first accept and auto-convert, because for those retailers, most of their suppliers (including their human ressources) must be paid in fiat for the moment. However, if more and more businesses (including the suppliers of those retailers) start accepting bitcoin, then it can become interesting for those retailers to pay their suppliers ALSO directly in bitcoin, and then the incentive to convert to fiat will be less.
Right now, a retailer cannot do much with bitcoin, so it is normal for them to convert to fiat, as that is what they need to use for their business. But as more and more businesses will accept bitcoin, there will be less and less incentive for them to convert coins to fiat. At a certain point, it will become interesting to get paid in coins too (at least part of your salary). But that's still far away.