This is exactly the point that I think most people miss here. If Apple ditches their hardware business model and goes head-to-head against Microsoft in the x86 OS market, Microsoft will absolutely CRUSH them into oblivion. All other considerations aside, Apple would be complete fools to attempt this. They are a large, profitable company with lots of cash in the bank - why toss all of that away in a feeble attempt to topple the giant which is many times bigger? Not gonna happen!
So no, Apple did not plan this. They may have anticipated it as a necessary evil, but I guarantee they will not simply allow such rampant piracy (especially at this stage when only the dev boxes are out in the wild) and they will not sell OS X for generic x86 any time soon. Maybe if they got their market share up to 25% via legitimate Mac sales and spent years planning, maybe then they could make that leap. But it would still be a foolish and incredible risky leap. Why give up the good thing they have going now? Seriously, who cares about world domination as long as you can make a nice profit?
My only fear as a Mac user is that we're just seeing the beginning of extremely rampant piracy of OS X / x86. People are used to getting things for free on the internet, and if not free, then cheap. 99% of people will buy something that's half as good to save 10% off the price. And people are used to getting their OS for "free" (it just comes with the computer) and not paying the higher prices that Macs command. So what percentage of those who want OS X will pirate it? Buy a cheap PC and download OS X for free since it's too expensive to get a Mac. Will it be comparable to the percentage that pirates Windows (and therefore something Apple can live with) or will it be much higher due to the demand combined with prices that seem unreasonable to the average consumer? That's the big unknown in my opinion.
Interesting times, for sure.