I have the utmost respect for the old timers that are as you describe JASP and would ski with any one of them any day of the week. I don't agree with your ratio of 10:1 though, if anything I see it as 1:10. I agree with others that have said that L3 is just the beginning of lifetime development, or could be; but without certification levels to force that process, human nature laziness does unfortunately take over and not in the small minority of cases either from where I'm standing, and not just for old folks either, I see 30-somethings and 40-somethings plagued with the same laziness, stubborness or just set in their ways or uninterested to keep having to learn something new. I see DECL's plagued with old or lazy funky dunky stuff too that would be outside the "standard", though that is less common amongst DECL's then amongst L3's that never bother with going the DECL route for a variety of reasons.
One thing they have started in our division recently, which I whole heartedly support, is that all DECL's in our division will be going through a once a year scored assessment, they all do it together on the same day. And the judges themselves also get scored on the same day. They have a whole process worked out. Its not a cert and nobody is going to "fail", but merely being aware of the score will create a sense of competition and desire for those individuals to get their score up and stay current. Interestingly, and you will love this, the highest scores last year (the first year of doing it), were gotten by older guys. Just proof that someone older can easily ski to the standard if they want to. Age is not really an excuse at all in my opinion. its not necessary to rip the zipper line in order to pass the L3 ski exam, only to ski well on how the examiners themselves are actually scoring everyone.