This is similar to what happens with the PC and MAC if you want. We all know Wozniak and others invented the technology but as amazing as it was, it needed a visionary to bring it to the masses. For that to happen, you need to make deals with Google, Amazon, Microsoft, Facebook and Apple. People will embrace Bitcoin or whatever cryptocoin they implement, that's it. Or they will create their own, which is most likely and that will be the one.
Bitcoin is like Napster if you want, Apple or a company like that will see the potential when it fits and create iTunes. But that took A LOT of impossible deals with the labels music industry moguls.
Somewhat reasonable analogy but as I recall Napster got literally nowhere where with big companies, and there certainly was not an entire nascent industry of VC-funded companies building around the Naptser ecosystem, whereas Bitcoin at least has some support from large companies (for example you mentioned Microsoft, which accepts Bitcoin) and many startups are building on Bitcoin, and this can really only be said to a significant extent for Bitcoin specifically (i.e. see above "to scale" list). Whether that is enough to not get replaced by iTunesCoin is hard to say, but the differences with the Napster experience are certainly there.
I understand the comparison is not perfect nor fair. However Napster had the piracy issue, their reputation was tainted. Bitcoin also has this to a much lesser extent, but really the average person doesn't care that it's "anonymous" or decentralized, for god's sake, they use Google and Facebook all the time. It just need to be somewhat secure, cheaper and easy to use. Bitcoin and others already have these features. To me it is inevitable that a major player will come out with it's own coin/currency and the rest are doomed.
It can be sort of a subscription and small limit plan too, kinda like store credit but that can be accepted and used in many places. If you have some extra iCoins, you can pay Spotify with that or renew a Netflix subscription.