said by zod5000:
Now with the 39.99 upgrades gone and win8 going full price, I think the adoption rate will slow down quicker.
My prediction. Windows 9 will make metro optional. MS usually rectifies big mistakes in their next version (hence why every other version seems pretty good).
If I recall correctly the Windows 7 family pack showed up some time after a promotional period. So there may still be some opportunities to buy Windows 8 at a lower price at an unspecifide later date. You make a good point though. Some people may take advantage of a relatively low price but full price is another story.
As for "Windows 9" as you put it, there have been some indications that Windows will move to a faster paced annual update cycle. That means there may be three updates within the traditional timeframe of a big OS upgrade. While I have heard there will be interface changes I have yet to hear about the return of the start button.
If I were to guess I would expect MS to offer the "option" of making the Start Screen look and act a little more like a traditional Start menu but with live tiles. Maybe sizable New UI apps options and better multitasking for New UI apps. I don't expect a huge departure from their current direction though,....