Just because Win7 doesn't look that much different than Vista doesn't mean it doesn't work differently.
Windows '98 looked almost exactly like Win '95 but it worked incredibly differently. And Win2k was the same way. WinXP was the first version since '95 to change the appearance drastically.
Win7 looks a lot like Vista, but it works VERY differently. It addresses all the problems that Vista had, and it does it rather well. It has a plethora of performance improvements over even XP, and it offers a variety of advantages too, like better security, more options, greater compatibility with more powerful systems, etc.
It won't stop everybody from using XP, but then, XP and Vista haven't stopped people from using Win2k (yes, many still use 2k, particularly since it's even faster than XP). It will, however, overtake XP as the "dominant 'new system' OS".
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