Yes, I guess though the concern is loading Medicare up even more.
Ending retiree healthcare insurance doesn't add anything to Medicare, because the company-sponsored insurance becomes "medigap" insurance once the retiree is eligible for Medicare.
All it does is make the employee responsible for paying the full cost of "medigap" insurance, if they choose to buy it. Depending on the extent of the company's subsidy, that can be quite a bit of money.
Some companies also provide health insurance for early retirees before they turn 65. Without it, an early retiree would have to buy their own policy from the "exchange" or elsewhere. It's expensive.