Bitcoin is currently a success in the same way Linux is/was a success: in a very tiny niche (geeks, sysadmins, tech-savvy folks, etc ...). Unfortunately, Linux never came out of that niche. It's still in there 15+ years later
You do know that 80% of the internet is run on Linux machines, right? This very website is probably sitting on a RedHat server or at least something Debian or Ubuntu based. And it's the most widely used OS on mobile (Android) world-wide. Add to that every game console uses a Linux kernel (If I'm not mistaken even XBox does). In regards to desktops/laptops, yes, small market share.
Yes, I am aware. And the Android part was discussed earlier in this topic. I didn't know that XBox was linux powered (I do in fact find it surprising). And if indeed someone managed to pull off with Bitcoin what Android did pull off with Linux, that is wrapping something completely unusable by normal people into a foolproof and useful thing, that would exactly address my concern. But there is major amounts of work before we get there.