Something tells me that users of Windows Phone 7.8 will not mind having Windows 8. Honestly, they won’t have it because there’s no reason for them to have it. Windows Phone 8 is for the new hardware coming out today, which the older phones don’t have. The Windows Phone 7.8 phones will have the new start screen, which is a huge improvement in itself. Three tile sizes and more color options.
Also, since Windows Phones seem to attract the non-tech person, I think this will be a non-issue for their users.