what do we need more memory for on our machines. Video files are already at a resolutions where any increase barely matters. Audio or any other multimedia as well. You won't be gaming on a macbook so that goes out of the window, and a lot of games actually work fine with 8GB. You can edit video or music with that much RAM.
Only thing that needs more ram is running Facebook, which is more of a problem with the sad state of webdev, not the MacBook.