There's another factor here to consider.
Just about every member of this forum has a real and vested interest in accural of points and status - some to the point of obsession
Out "there" in the real world of regular folks flying.. this is not the norm. I would reckon a bunch would focus more on points to get "rewards"
those with status.. some do not even know all the benefits, and those that do would use them, but probably not make a HUGE effort to retain the status, specially if it might mean extra flying with their own dime and time.
Many of us are focused on these "status goals" like they're the only thing that matters. Most people travel to go places and do stuff
I mean we do too, but not most "normal" people could care less about the rest
and in terms of LT status I imagine by the time most folks might reach LTG or a hypothetical LTP level, it's more likely than not been as part of business trips paid for b others (note: Every single SC I have personally earned has been all personal travel, but I am totally in the minority here
) ... my point being that, for most peple, once that travel finishes up either through job change or retirement, the use of the perks of the status will taper off to, most likely, leisure trips and probably far less.
Remember meny of us love to get in a tube and scowl at another offering of Shaw+Smith.. most people see it as a chore and just want to be there and sure using a nicer lounge and having an extra bag allowance is really nice, but it's simply not that big a deal to most people out there.
And yes, if some person is working hard and attains say LTG in their 20's or 30's with a lot of travel to go.. if it's paid travel with QF then QF is still happy for ongoing revenue.
The reality is once someone reaches a level such as LTG, if they are still flying they likely do enough to retain that status on their own (so zero cost to QF) or even have higher (such as a LTG P1 like me, or LTG WP like many here). So.. minimal cost to QF or worry
and if post retirement folks take their grandkids into the J lounge for the trip to OOL or LAX a couple times a year that's really no big deal.