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First some non-technies won't even know that there is no support. Others won't care. They think they are careful enough that they won't have an issue.
Even if Windows 8 sales do tank [a bit] it wont' drive non-techies to Vista. While Windows 7 is still selling, more will look for a Windows 7 system.
Non-techies are use to what they have. Some small changes to go to Windows 7 isn't a problem. Completely switching to a different platform is. Apps they are familar with won't exist.