Ah yeah, you're right. WOW64 appears to not be going anywhere anytime soon.
Although. I gotta say, I don't use windows much, but some folks I kind of helped out on the side were upgrading to Windows 8 and were completely unable to launch their 32 bit XP accounting software binary with every emulation flag I tried. (could just have been my inexperience on this, but wasn't finding anything in the support guides).
Oddly enough, it ran fine in Wine in virtualbox in a small ubuntu instance, so they ended up just using that in seamless mode.
So, at least from past experience that legacy compat is not 100% and I'm guessing games might be even more finicky than accounting software.