I moved off XP long ago, when everyone should've when the unjustly maligned Vista was released. As the former Internet Services Administrator for a Federal agency renowned for its technological prowess, I have learned the value of moving off obsolete systems. I like to keep my computers up-to-date.
Going back to an XP now, after so long running Vista, 7 and 8, is like back in the heyday of XP and having to go back to using a machine running Windows 3. Its clunkiness and comparative inelegance is so pronounced as to be really annoying.
XP is an inherently vulnerable operating system that has kept Microsoft's engineers working feverishly throughout its life playing a game of "Wack-a-Mole" with an endless string of vulnerabilities. The exploits of these vulnerabilities will proceed apace, but patches to block them will no longer be delivered to users. Those who cling to XP will soon be completely bereft of any protection against newly launched exploits, and the remaining size of XP's installed base ensures that such exploits will continue to be launched.
This might be fine if you don't communicate with others, but your machine will become a vector threatening the more modern computers of those who trust you. You will become a danger both to yourself and to others, others whose only lapse of judgment was in trusting you.
I still have an XP machine, an old laptop, and I installed the final patches yesterday. I never use it for anything except keeping it updated and have kept it only for sentimental reasons (it got me through the darkest period of my life in 2005, where my deeply beloved only daughter lay for months dying in an intensive care hospital ward after open heart surgery and an ensuing pulmonary infection where she sank so far down that she was given last rites, only to rally and now she is fine, healthy and happy). It's only running XP because it's too primitive to run any more modern MS O/S, but before the month is out I shall convert it into a Linux box and that might even enhance its functionality to the point at which it can again perform productive work.
But Microsoft's continued support for XP has been an absolute disaster for computer manufacturers, and for themselves as well. Both the IT and the business press have bemoaned the slump in new PC sales, and the continued support for the long-obsolete Microsoft XP is largely to blame for this phenomenon, permitting people to keep running their old PCs, instead of buying new ones, to the point at which the landscape looks similar to the automotive landscape in Havana. XP is like a bad penny and, as students of Macroeconomics are well aware, "Bad money drives out good."
Isn't the PC industry something you WANT to succeed? I know I do.