There are really two markets for processors: consumer electronics, and real computing. ARM may be the best processor (whatever that means, as it's a design you license, not a piece of hardware) for looking at ads on a 3" display, but I think Intel is still going to be relevant in the server market for a while. Think about some of Intel's key assets like being really fast and having a C++ compiler that makes C++ even faster. This is important because programmers write horrendous code that needs hardware assistance to produce answers in a reasonable amount of time. (There are also problems to solve that require a lot of CPU power, like protein folding and finding the next Mersenne prime. ARM processors are not used for this.)

Now, if you're saying, "yeah, but not for desktops", I can agree with you. Desktops are going to become less and less powerful as the average computer user becomes more and more computer illiterate ("the Facebook dumb terminal", I'll call it), and ARM may help keep the cost down. But I'm probably not going to be running Emacs on an ARM box anytime soon. (Hell, I even use x86 for my router.)