Makes a huge difference in what? Preparing a powerpoint for the students? Or sending email to the colleagues? Or downloading the latest movie from torrent? C'mon, there are for sure certain tasks that will benefit from more RAM and better CPU, but those are certainly the tasks that a "sane" person would likely do on a MBA (except virtualization, maybe).
I speak for myself, but as I said before I do quite a lot of image analysis and statistics. Well, let my tell you that I do these tasks on my MBA but also on a 12-year old PC with a P4 and 512 MB of RAM. Difference in computation time: 10% maximum. RAM usage: I don't care, as long as any computer can successfully complete a task.
What would be the great improvents of a new generation MBA in normal life? 😕