I was making the point I don't do anything too extensive with my MBP that I wouldn't be able to do with an iPad (besides papers). I guess I mean upgrading the longevity of my mbp by getting the new 13".
I see.
I really think upgrading your computer isn't necessary at this point. The screen will be nicer, and the SSD will make things feel a lot faster, but that's a lot of money for power that will largely go unused. I guess you'll get better battery life too. It's a crapshoot. I'd definitely rather have an older laptop and an iPad than a cutting edge laptop and no ipad. My iPad sees 90% of my daily (non-office) use.