I kind of disagree, but at the same time I know that it would take some changes by every manufacturer to make it truly work.
Simple solution is - each mold has the disc type in the tooling, similar to what I've seen on newer discraft discs.
Less simple solution - bag checks, and just go by what can be found on the disc. Sort of like in magic: the gathering tournaments on a smaller level, TDs do deck checks but may not always know what's been reprinted from older sets, so they err in favor of the player (or look it up if there is enough time).
Yes, I did just make a MTG reference. :\
If I were to participate in a tournament like this, I'd throw:
6 PDs in various plastics and stages of wear
2 FDs, one C and one S
1 Predator
3 Comets in various plastics
2 Pain in various plastics
1 gator in champ
4 judges in various stages of wear (and various plastic when it comes out)
I wouldn't really see myself pushing a 25 disc limit at all, but 7 molds would work out just about right for me and my game.
So your solution is to eliminate all discs made before date "X" when they didn't have those numbers? IT wouldnt work unless everyone was using all discs from the same era. This would only help the DD/Lat 64 teams and the Prodigy teams Then you still have to police the DG companies that they aren't spreading a tooling reference # across ....blah, blah, blah..... Never gonna happen, and it just won't happen.
BTW I have about 3000 magic cards from right before revised to 4th edition and ice age. One of those 4 18" section baseball card boxes full plus another 18" baseball card box + a bunch of my favorite decks and some cards in 9 panel display sleeves... lol what a dork. I buy some from time to time but the new rules are beyond me. I have about 30 dual lands and a bunch of older rare things. I hate that they re-print things and make the old ones worth less. I guess the restricted cards dont get reprinted as often like demonic tutor, those dual lands, fork...things like that.