Care to explain why? Such bold statement and no backup?
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I have and iMac, MBP, and the MBA and I love them all. I'm not selling any one of the previous Macs, because I love them all. I'm even thinking about getting a Mac Pro to replace my gaming PC. They all have their pros and cons, and MBA fills a gap/niche that Macs lacked for a while. It can do what a larger capacity Macs can do 95% of the time for practical use, in my opinion.
I love the Air... I've had it for 6 days now and can't seem to stop using it. It's a pleasure to use and I've felt the need to go back to my MBP only a few times. As a MBP owner, you know that the biggest issue with the MBP is the weight. I don't think there are many people that can hold a MBP on one edge with one hand, without struggling. Everytime I've used my MBP in bed the weight was always an issue. .. Not anymore!
My advise... You should keep your MBP along with the iMac and keep it at home for other use (like the living room or kitchen) and use your MBA for school use. You can't never have too many computers.
So, listen to all the positive comments on this forum and go get one!