They were already being phased out for the reasons you specified, plus the fact that they’re less efficient. There’s a ton of 757’s and 767’s out there that are leaving passenger service and are being converted to freighters. Even with the conversion costs, they’re relatively cheap. And they’re more efficient than the MD-11.
CC
Right? But UPS has slow-walked a made-order migration to 7*7s, to milk their remaining two-dozen-plus MD-11s until something like this very thing happened. Sad.