Agreed. Whether or not lead emissions near GA airports has any statstically-significant impact on the environment is moot, since any detectable lead emissions will be used as a rallying cry to help shut down more GA airports. That’s besides the fact that the lead in 100LL is not friendly to our engines (aside from the octane boost, which most planes don’t even need), and at some point the TEL additive will become harder to obtain. It just makes sense to continue the efforts in getting the lead out of our fuel, and it looks like we are actually nearing the point where that will happen at a sufficiently large-enough scale.