1-2% of PC shipments
sounds like a lot, doing a quick search I saw a news site say Gartner predicts 368 million PCs in 2012, if MS can push 3-7 million surface units in 6 months that'll be pretty impressive. I'd think more like 1-2 million.
Another site I see says Samsung shipped ~1.1M tablets in Q2 2012, with the next closest at about 1/3rd of that.
MS betting the farm on this is pretty scary, I don't see it ending well but I also don't see them giving up either they of course have the cash to keep trying. I'm sure they'll get it "right" at some point but setting such high expectations for a gen1 product really REALLY reminds me of WebOS and the HP touchpad (or RIM for that matter with BB10). Keep expectations lower and over deliver. WinPho7 received similar hype before it's launch and it's gone nowhere of course.