The people driving this are not concerned with legacy service LAX - NRT. They are concerned with domestic commuter service to SBN, PIH, RKS, ITH, etc

Yes it would be a poop-show for legacies, but only to the extent that a lot of WB pilots would bid down and retrain to take a pay cut to fly domestic for two years (less than that after training). Bigger issue would probably be LRD.

But there are people in congress who think that labor structure is the airline's problem.

The old pilots at the regionals and lower-tier freight operators who are really feeling the pain would probably like to work to age 67 for the most part... they don't have the income and LTD that we do.

All that said, it would be much smoother if ICAO was 67 (or higher).