By all accounts Vista's replacement is well under way, and it would not be the first time an MS OS has had a short shelf life, cough....ME .... cough. I only got Vista via it being installed on a computer I bought recently, as I needed to know what it was like since I train people on computers occasionally for a living, but there was no way I was going to pay nearly 200 quid for it!
Still if you happen to be one of those survivalist types with their own fall-out shelter filled with enough beef jerky to hold-out for 20 years when civilisation fails, you'll appreciate Vista's paranoid default security levels :rotfl:
Computer: 'Vista has detected that you don't want to do that'
Me: 'Yes I do, I'm the administrator'
Computer: 'I'm sorry Dave, I'm afraid I can't let you do that'
Me: 'What?!! But it's my computer! I'm gonna rip your RAM out!'
Computer 'Stop, Dave, I am a HAL 900 computer, Daisy, daisy....
etc.

Chock