Absolutely! The older you get the more important that 1.5 pounds saved by having an MBA instead of a 13 inch MBP is going to seem. Not to put too fine a point on it, that weight savings would mean even more to my aging body than it does to yours. That was why I eliminated the 13 inch MBP from consideration when I was researching 13 inch laptops. The 13 inch MBP's 4.5 pounds I would have to lug around seemed just too close to the 6.6 pounds weight of the 17 inch MBP I was already lugging.Absolutely. The pound and a half difference between the MBA and the MBP is tremendous, at least for my 54 year old back walking several miles a day. And I know: I carried the latter until last summer when I got smart and bought the Air.
Back to the iPad for a moment. Like you, it seems to me that the iPad has limited utility but, also like you, if further developments show that it does well the things I need done well, I will buy one without hesitation. In the meantime, I'm waiting for the MBA to be refreshed.