actually, I think the rules should be changed too.
I think most people burn to DVD, it cheaper and faster to burn. Not all people want full DVD-R. I prefer rips. They are easier to download and transfer around. I have over 10 000 movies, that would take a shit load of room -- even if they are stored in binders in a library -- to just burn them all on CDs as I did a few years ago.
Anyway, I think using fraction of a DVDR size make alot of sense. It's also a natural way to slightly improve the quality of the rips, without any concessions to the amount of movies you can fit on each DVDR. With the current 700mb, you do lose about 250mb per disc. Could go from 1/6th for movies that are under 90 mins, 1/5th for the 90-100 mins movies (the majority of them) and 1/3rd for 100-160 mins. 1/2, 2/3, Full, for movies above 160 mins.
If you want less rules. Maybe just split it in-between 1/6th 1/3rd, 2/3rd and full DVD-R for size of rips. They already do it plenty outside the official scene, I think it's a good idea really.