Re: What prevents Linux from conquering the consumer PC market?
No. You are not likely to look at your friends with their Macs and start to get jealous. If anything, those Mac users will likely have the same exact problems as you do.
A Mac is nothing to lord over Linux. It doesn't matter how overhyped and trendy it is. It still has the same "but it's not the monopoly platform" problems that Linux does.
Short of games, if you aren't brand fixated to the exclusion of what you actually want to do then none of the platforms are at much of a disadvantage to the others. Although Macs have an NIH and group think problem.