Right, but you're not looking long-term. If this kind of thing goes mainstream, with time there will be no reason for companies to make Mac apps. Slowly, people will trickle back into using Windows as there are fewer and fewer Mac apps. Eventually, Macs will be down to a base of pro musicians, video editors, and compositors using Apple's pro software. Back to the "Macs are for creative pros" myth, back to the mid-90s when Apple was langushing in despair.
Or they'll be more popular than ever. Either way, the next few years will be crucial for Apple's future.