The thing is i find people get caught up on speeds and specs, most people don't need a Macbook Pro, the Air or even the 12" Macbook is good enough. The problem is that people think that because a machine is faster it automatically makes it better, which would be true IF the individual is going to use that power, other wise it's just wasted.
For me personally i feel that the Macbook Air will be enough, if i upgrade the Ram to 16GB and get the 512SSD storage i think it will last a good few years (just like my early 2011 Macbook Pro did). However is Apple likely to update it later this year with a small spec bump maybe.