I'd say "not a chance, it's been failing for like 10 years"
but a modern Windows tablet could have some serious impact on the market.
Here's a device the same size as an iPad that's capable of running Windows XP or even Windows 7. Corporate IT guys will love it as it can be treated just as another computer on the network. Developers of Windows apps will love it as it requires bugger all recoding to work. Web developers will love it as it's just another computer- it's not yet another type of hardware that requires yet another version of the webpage like the Apple tablets.
Linux lovers will adore it (so long as it's cheap enough for reasonably mass adoption)- they'll be able to load Ubuntu on it to really show off with what Multitouch can do.
Lovers of the Cloud would love it as all that power and the billion-and-one applications already available just begs for always-available offboard storage.
Even users should love it- Windows7 has multitouch so all of the gestures that work on their smartphones and existing tablets will work. Plus all of their existing, familiar applications work. If you'll scale down the graphics it might even run WoW for them. And, using StreamMyGame or similar (clients for which already exist, remember), yes- it will run Crysis. If your gaming PC will.
This could be the first proper Mass-Market tablet. Something that my mum, my co-workers and my non-techie friends not only could use, but _would_ use.