That's what I'm hearing...but it is a huge thing to get to a legacy/major, or FDX/UPS, and the odds are not in anyone's favor. So, saying "I'm gonna go to Delta or United" is one thing, actually getting in a class is entirely a different thing. Therefore, even though I'm hearing the same numbers, I think 50% of the under 40 crowd is too large a percentage...
That said, it is up to the company to prevent that...how do they do that? Heck, that's simple...start treating their employees with respect, follow the CBA, and give us all some incentives to stick around for the long term.
Good luck (to us all!!)