This is the key that people are missing. This has no impact on the millions of people who have Windows 7 and would like to upgrade to Windows 8.1, if nothing more than to try it out. I have 3 machines all with full legal license to Windows 7 that I purchased for $150+ (Family pack but I also had a $100 off gift card). I looked at Windows 8 and thought I'd give it a try but not for another $225+. If it was $20 per machine, I'd do it in a heart beat.
MS should just drop the price for the full version to $49.99 (one version, includes everything); and $19.99 for the upgrade. Get the people to move, to upgrade, to keep moving with the technology. Sell them Office, sell them other things, sell your enterprise services.