I think Gateway has been making too-stiff putters for years without thinking twice about it because nothing has ever been done about it. I think Innova and Discraft have as well. Anybody really think that the Cam Todd Challengers or 10X KC Pro Aviars would have passed this?
Also, wouldn't disc design have a lot to do with this? Wouldn't it be easier for say a Magnet to flex as opposed to a Wizard just due to the bead?
So the PDGA should make a sweeping statement that going forward, discs will be more regularly tested before mass production, and randomly throughout. If they fail, production must be stopped until the issue is fixed. Current discs should be grandfathered in for X # of years. All molding going forward must have batch #'s molded on them. Then if recalls are required it is easy to track. Also, a list of illegal discs can be posted online, and TD's can have a list as well. If a disc is questioned, it can easily be checked against the list.
Extra work for manufacturer? Yes. Extra $1 a disc charged? probably. Extra $1-2 for PDGA membership? Likely. But then it would be easy to test, check, and know legality of discs. I highly doubt anyone would check a bag (except at NT's and Majors, where they would be checked prior to each round (it'd take no time really, right before Tee-off. Each player should know if their stuff wouldn't pass, since they'd have access to the official list of recalled discs as well.))
If the PDGA actually cares about this rule, that is a way to start enforcing it without completely ticking off the Disc Golfing Community. If they don't care to do this extra work, then the rule should be removed.
Edit: And I am a major fan of stiff firebirds, so this would suck, i hate floppy discs. But as long as the rules are laid out, with a grandfather clause for a period of time for learning new discs, i would accept this.
Edit 2: And if i were a manufacturer, especially new (DD, Prodigy) I'd be insuring that every run of my discs meets the test if it stays on. Seems easier to start a solid testing program during initial manufacturing, instead of 20+ years of doing the same thing.