I think this isn't targeted at the classic computer market, the one that Steve Jobs said is like like trucks. instead, it is an attempt at building a computer market that is closer to general appliances, like TVs or cell phones. Quite similar to iPad's approach, but with more focus on productivity and the web.
Whether it works will depend a lot on marketing, and also on us hackers creating the compelling web ecosystem. I already mostly live just in the browser and many do the same, so maybe the world is ready for this. We'll see