There's such a deep seeded, systemic bias against linux that it actually can never win, to any degree or magnitude, because the moment it starts winning we just move the goal-posts for the flimsiest of reasons to ensure it can't quite claim that victory.
Linux is obviously and clearly the most popular operating system kernel on the planet. Oh, no, that's no good a measure, servers are messy, let's refine it to most popular consumer operating system kernel? Oh... it, could also reasonably claim that title? No no, no Android, that doesn't count. Nope, No Chrome OS either, you can't have that, that's, well, that is linux, but its not. Just nice, pure, desktop linux, yes, perfect, arch linux, kde desktop, that'll never trend up and thus is the perfect new-new definition of desktop linu--wait hold up, I'm getting word this is, not possible, its actually SteamOS? Nope, kill it, that's not desktop linux either, kill it.
I'm not overly optimistic given that the biggest barrier to supporting Linux has always been how much variance there is in terms of what's out there, but it's still a good thing for Linux.
In terms of perceptions of desktop Linux I don't really think it matters. Linux isn't going anywhere and as software probably has more penetration right now than any other operating system ever has.
Nope. The biggest barrier is the FUD around there being so much variance. 99% of desktop Linux is glibc-based. Beyond that, binary compatibility is no harder than Windows. Differrent yes, meaning devs used to Windows have some learning to do, but not drastically different even.