If you want to play chicken with the Microsoft product cycle, you're going to lose.
No offence, but the number of developers dev-ing for Windows XP is such a tiny drop in the ocean compared with Win7 developers that Microsoft would prefer to make VS2012 more awesome for Win7 developers than spend time supporting it on WinXP.
Is it? I thought a majority of businesses were still on XP. I know we still are, and I have a hard time finding reasons to upgrade. As long as OEMs still make XP device drivers, we'll be on XP (much to my dismay).