As of April 8 (last week) the final patch for XP was released. Even if these patches are still available for the next ten years, they won't reflect security issues that come up after 2014/04/08.
If you read the numbers quoted in the article cited by the OP, Windows users break down like this:
- XP - 27.69%
- W7 - 48.77%
- W8.1 (April update) - 4.89%
- W8 - 6.41%
- everyone else (w8.1 not updated and, presumably, Vista) - 12.24%
That means Microsoft just abandoned more people (XP users) than they're currently supporting for Windows 8 in all its variations (W8, W8.1 and W8.1 April update). If you add up all W8x users (4.89% plus 6.41%) along with the leftovers (12.24%) and somehow figure out how to drop Vista users out of the 23.54% that comes to, you've got somewhere between 10% and 20% of all Windows users who are using W8, W8.1 and W8.1AU.
That's a pretty risky move for Microsoft, abandoning so many of their long-time users. It's only going to work out well for them if they can keep it under wraps that they just abandoned almost a third of their users. Otherwise, they could have a user revolution on their hands and be forced to reinstate support for XP.
As someone else stated earlier in this thread, support for XP was supposed to end years ago. Why didn't it? Because Microsoft would have been taking too much of a risk.
Ending support for XP now had better work out or Satya Nadella may find himself in the same unemployment line as Steve Ballmer. The so-called Data Culture he's pushing could work with the XP OS, but would be restricted in ways that no one is talking about, ways that are built into Vista, W7 and W8. XP, you see, was the last Microsoft OS that didn't install .NET as part of the base operating system. And .NET is what makes the Data Culture possible. Anyone still using XP isn't required to buy into the Data Culture mindset. All they have to do is uninstall (or not install in the first place) any .NET redistribution packages.
But for musicians, the bottom line is this: if you're using XP for an offline music mixing machine, you should be able to use it risk-free for an long as you want. You won't have to worry about Trojan horses, spyware or viruses if you download files on a different computer and sneaker-net them over to your music computer. Just unplug that Ethernet cable, yank out those wireless client drivers and cards and keep on keeping on.
The only thing you have to worry about is when Cakewalk abandons XP.