Seems unrelated, but guess what software changes and evolves. The biggest reason to upgrade to windows 8 is that 8 is higher than 7. People still running XP are like people running a linux kernel 2.4 because 2.6 doesn't really have anything you need...of course it doesn't...its about the long term aggregation. XP doesn't run IE 9...why we have so much IE 8! Just upgrade already or buy a new machine or whatever...just do it. Yah your 1997 honda civic might run "fine", but I bet it has a tape player.
Having an OS that can run well on a tablet and well when in traditional PC use is going to be hard and it's going to take a few versions for anyone to get right.
MS is NOT apple. They don't need people standing in line on release day clapping at one another to be successful. No one gives a crap about some big line outside of a Best Buy. MS will sell this OS just like Windows 7....slow and steady. Apple wishes they sold even a fraction of the number of Windows 7 licenses of anything. Windows 7 = 670 million total, Ipad = 84 million.
This idea that Windows 8 is going to be Vista is sort of silly. Enterprises will likely have a Software Assurance or whatever MS is calling it these days and so the upgrade is just a matter of when not if.
Windows in the home? Windows in the dorm room? Harder to predict, but probably less often, but not less. You might get an Ipad every year and a PC every three. I ain't paying thousands more for a damn silver laptop I use every 3 months...some shitty 500 dollar Acer ultra book will do just fine. For the college student maybe a Chrome book is good nough.
MS is essentially the new IBM. They will come up with new products and people everytime will try and compare them to Apple...and everytime it will be for a different market no stupid day trader or CNet reviewer will ever understand. You never see "DB2 10 wil be a SQL Server 2012 killer"
p.s. If I hear another the "ribbon" in office is worse I'm going to shoot someone. The ribbon is better, if you don't think so your just old and stubborn. Your probably reading this in Chrome...u see a file menu? Even the three line menu is just a vertical ribbon. If your in FF do you see a file menu? Why do you think FF feels clunky? Techies love to hate Windows new GUIs and so there will be Metro haters...MS is smart enough to not care about techies and haters, but to care about average users.