Low pricing does not necessarily mean high sales figures, unless the clueless masses cannot read the numerous articles claiming Win8 solves nothing and confuses more than it endears itself to users. It just is not a good fit for a typical desktop user.
It's kind of cute that you think the clueless masses are going to have a choice. Just like with Vista most of them are going to buy a new computer that comes with 8 and they'll have to like it or lump it. Just like with Vista some OEMs will offer Win7 as an option as long MS allows it, but the cheaper ones will come with 8 only because testing with and supporting 7 as well will eat too far into thin profit margins.
Tell the people you support to get a new machine before October, because otherwise they might well be out of luck.