I wouldn't sell someone an MBA unless they completely understood all of its drawbacks. Now if someone still wants an MBA knowing all of this, that's their decision. And in truth, everyone should know what they're getting before they buy a new computer anyways... so it's really not up to the salesperson if someone says they want something. If someone asks me what I think, I would tell them to buy a 13" MBP over the MBA UNLESS they completely understand the one advantage of the MBA, ultraportability.
I completely agree. And that's the reason why I only sold 2 MacBook Airs during my tenure with Apple. People admired it, and when they asked about it, I told them what they could expect. The majority of college students/parents who came in were on a budget, and needed the best bang for their buck. Unless they were going into engineering, architecture or design, the majority of them walked out with the mid-range MacBook, as it really was the best value for any computer Apple sold at the time.
It's really a case of want vs need. That can present itself in a few different ways though. I want the power of a Mac Pro. The majority of the time, my needs are filled by the MacBook Air. I desire the form factor of the Air, but I'd like to pay something around the price of a MacBook.
My advice is simply this, and it's some of the best advice offered on MacRumors: If you
need a computer now, buy it regardless of the specifications. If you can afford to wait, then wait, because something better is always in the works. Even now, Apple is probably looking into the next MBP (and probably even the one after that) because of the lead time required to create these amazing machines.
I don't need a laptop right away, so I'm content to wait.