The iPad "replaced" laptops for some people, and the Surface has the potential to do that for the same people and more. Professionals, creatives, gamers, etc. which are a pretty large group of people.
I don't think it's replacing a "creative's" laptop. I doubt it'll have the kind of memory "creative" people now expect (16GB range). I don't know any "creative" people that want to use Intel graphics (as nicely as they are coming along) to transcode Adobe Premiere videos or edit 1.5GB Adobe Photoshop files. Certainly no "creative" person is going to want to install 3D Studio Max or Maya on this. And now that I think about it, they wouldn't want to install ProTools on it or otherwise try to mix and master music. So what creative people are you talking about?
Also, it's been clarified earlier in the thread that beyond games like Bastion, Limbo, Half Life 2 and similar games, the setup in these tablets aren't going to offer framerates that will make gamers happy. So sure, for smallish, indie games it'll be fine...though it also must be said that those (Steam) games aren't designed for touch anyway, thus losing some convenience.
That said, I agree that the group of people for whom this could replace a laptop is larger than the iPad market. Then again, that's always been true of TabletPC's, of which I own an HP Elitebook TabletPC. But let's not get carried away with thinking all of these broad professions will look at this and see a device that can replace their hardware. Extend it, perhaps. But not replace it. For regular home users that don't do much, it'll be good.
You don't know what price it will be and your view about whether it will be a game changer seems to be against the tide of public opinion. So much so indeed I'd put it down to an irrational and unfounded fear that if the Surface Pro takes off then somehow your iPad purchase loses legitimacy.
The Surface Pro can be $1000 for all I and many people care, if it has the functionality then it can replace both iPad and laptop in one fell swoop and for that reason it's an investment.
We know it's not going to be $600 for damn sure. Projecting a price range isn't rocket science, you know.
Also, money is no object to me. I have iPads, touch pads, Tablet PC's, custom built desktop PCs, Macs. There is nothing irrational about what I'm saying because I'll own it all (unlike you, perhaps). My thoughts are my objective opinions, and I have no emotional feelings either way. It's just stuff...that I buy.
I'll have another TabletPC when Windows 8 comes out, whether that's a surface or an Icona or Lenovo or whatever is deemed to be the best. Just like everything else I buy. There will be no shortage of tablet options that do exactly what you're describing. It's just a matter of whether or not it does anything BETTER that will determine whether the masses think $1000 is a fair price to pay. Few will buy a jack of all trades and master of nothing. Except people like us, who buy tech because we can.