Honestly, if someone would develop a compelling alternative to Windows for OS X users dissatisfied with Apple's direction of the Mac, then that would be wonderful and I'd switch in a heartbeat (I'm typing this on a 2013 MacBook Air; I'm want to buy PC hardware in light of today's keynote, but I don't like Windows and unfortunately desktop Linux still isn't polished yet, although I am a regular user of Linux and FreeBSD in servers and VMs for development). Back in the 1990s there were a few alternatives to the MS-DOS/Windows ecosystem; besides the Mac, there were IBM OS/2, NEXTSTEP, and BeOS. Unfortunately by the mid-1990s these alternatives couldn't compete with a growing Windows monopoly and a Microsoft that was willing to throw its weight around to squash the competition. But times are different today. While the Windows monopoly on PCs still exists, the computer ecosystem seems to be friendlier to alternative OSes these days, given the fact that much of the personal computing experience these days is Web-centric and thus platform-agnostic. Plus, Apple's increased marketshare over the years, as well as the presence of desktop Linux, has forced some developers to consider the fact that not all computer users run Windows.
I think the time is ripe for a Windows alternative for disaffected OS X users. In fact, I'm willing to contribute to such efforts. Who's with me?