I suppose that depends on if this is going to be sitting on a desk all the time, or just occasionally fished out away from an AC socket. I have no doubt that it will for many people, who don't know what they're buying - but the fact is, that those people would be just as well served with a Macbook.
I'd rather trade the CPU and GPU for the relatively pathetic runtime, given the machine's intended purpose as an ultraportable. If you actually use both - actually, either one even - in mild anger in slightly high ambients, the machine does a Rev.A anyway.
I personally hate the unibody MB's display. I know because I am using one right now. I don't think someone that works on a Mac all day would be happy with the display on the MB. The MB has plenty of power, and the optical drive is nice, but holding a MBA and traveling with it is a sure joy. One who owns a rev B MBA with SSD will have a hard time downgrading to a unibody MB. In addition, I spend time in the evenings, on the couch, and even there the MBA is much more pleasant to use. I am not currently happy using the unibody MB - it's superior to the MBA in every way except the display, weight, and overall portability. And those differences are incredibly important!
I am a professional but a business professional. For me, the MacBook Air is the perfect Mac. In fact, the rev B MBA is my favorite computer ever! It is perfect mix of power and portability in one. I believe in a one Mac system. If I wanted more portability, I would use a netbook. If I wanted more power, I would use a MBP. I need the power of an MBA, and I want the portability of an MBA too. I feel the 15" MBP is too big and heavy to travel with, too big for opening in airline seat, and not fun to carry in tote at nearly double weight of a MBA.
Before my rev B MBA was stolen, I spent about three hours per day plugged into a 24" LED ACD doing real work. The rev B MBA with 1.86 CPU and SSD is a real workhorse while plugged into the ACD -
DESKTOP EQUIVALENT. Then, I went to client offices for a few hours in afternoon (usually always unplugged). I need a light Mac that has a nice display, yet is super portable and fast to bootup and etc when working with clients -
PORTABILITY. I returned home in the evening, and used the MBA at my couch, where I (still) have an extra MBA charger plugged in ready for use. So, I spent up to three hours per day away from charger and rarely drained it completely. The perfect MIX of Power and Portability!
For me, I want to use the MBA as a primary Mac. When need to really work, I plug into an ACD. When doing graphics stuff for web, I plugged into ACD. When working on video or photos, I worked on ACD. When at home on couch, I usually do fun things like write, check favorite sites, watch videos, watch movies, surf web, and generally entertain. I don't need the power of a MacBook Pro. I don't need the battery of a 17" MBP because the way I work is set and rarely use it for more than three hours away from home. At the same time, I need it to be quick, which the SSD makes up for the lower clock speed and etc. I cannot believe just how fast the SSD makes the rev B MBA for common tasks. I never waited on my MBA for anything. Fast boots, instant app opening, everything is fast that I do!
So, I think the GPU is fine because I am not a "pro" that needs dedicated graphics. I would rather it be portable than make it bigger case to deal with heat generated of a better graphics card and heavier to get dedicated graphics. For me, the MBA is the perfect size, weight, and power. What it is missing is RAM and drive space.
A rev C MBA should see the expected evolution of 4 GB of RAM and a 256 GB SSD. That is what would make me most happy in my opinion. At the same time, I do hope for extended battery life with the smart battery tech used in the 17" MBP. If adds a little weight but lasts an extra hour or so, it would be worth it.
IF, there was a 13.3" MacBook Pro, that was weight of the MB and had a 3 GHz CPU, dedicated graphics, had 8 GB of RAM capabilities, optical drive, and a standard 2.5" SATA drive, so I could put a 256 GB SATA 2.5" drive into it, I would seriously consider moving to the MacBook Pro. That would make a real reason to move from the MBA.
However, a soon released rev C MBA with 2.13 GHz CPU, 4 GB RAM, 256 GB SSD, better battery, glass trackpad, and etc would probably make me happy for a couple of years!