It's 13 years since XP was released to a grateful world. Three service packs followed to get it Quite Right and since then it's been a useful tool.
Yet to read posts on this thread it still won't remain a viable proposition without those weekly and monthly updates, debugs and anti-malware releases. I'm glad my car was not sold to me on the same basis.
Seacue, I haven't asked them all but the ones I have researched say they have no plans to withdraw support for XP anti-virus and-anti malware..