Missing answer option

There should have been an option to answer: No, why should I upgrade when XP works perfectly well.
Whether Microsoft stops supporting XP or not is irrelevant, since it works well enough now with SP3. In fact, installing Win 7 or 8 onto an existing computer is a very bad idea because it breaks a working system, partly because of the newer versions being so bloated, partly because there won't be working drivers for many of Your existing hardware devices. Claims about security issues are moot because hardly anyone uses Microsofts security measures alone, if at all. The software and hardware support for XP is the most comprehensive of all Windows versions ever.
If You buy a brand new computer then it's a different question alltogether, since there will be new hardware on it and the drivers are specifically designed to work only with a newer OS.

In other words: if it works, don't fix it.