I suspect that Windows XP will be around for a while yet.
There's still some people providing unoficcial suppoort and updates for Windows 98!
http://www.htasoft.com/u98sesp/This "service pack" provides many updated drivers and patches, and modifies the Kernel so it'll run a number of Windows XP programs
I did install this on an old Windows 98 PC a few years ago, and it was surprisingly good!
Expect similar for Windows XP
nb Google have said that they will continue to support Windows XP with Chrome updates for another year.
Ian