Unless you're an enthusiast, the upgrade would have to solve a problem you have with the old system or provide new functionality. While I am in the first group and upgraded to "7" x64 2 days after release, there are many users that don't even use XP to its potential and sure wouldn't gain much from the upgrade, other than having to learn their way around. For them it's an unnecessary expense and a risk of running into upgrade trouble, not to mention the confusion the redesigned interface will cause to casual users. (Better or not, if it's not where it used to be, many users quickly get lost.)