That's definately an option, however with regard to the point about people leaving due to the tightening of conditions - many people on here and on other sites around the world claim that numbers went into decline when reactive gear came into play and the sport was "cheapened" with easy lane conditions. If that is true, then the sport should start to go the other way again if this policy is introduced.
Also, with regard to running the sport leagues for the more serious players and leaving the ditched up leagues for the less serious league bowlers, this creates a problem in that to the world outside bowling, "a 200 average is a 200 average". We know that's not the case, but they don't.
The problem already exists in the US with the PBA Tour. They work hard to average 220+, but to the average league bowler at home averaging 220 in their ditched up league house, they go "what's the big deal, I average as much as they do, I should be a Pro" and hence interest in the Pro Tour declines...
The same could happen here, especially with bowling getting back on TV in some cities. I still think the best solution is a national policy for all TBA accredited leagues....