I'm 1/12 this year on UA, I already took most of my business elsewhere.
The only flight I got upgraded on was an award ticket on a Wednesday night IAH-SAT on a 739. Pretty much every flight I am on has almost no upgrades listed on the cleared list. I am usual near or at the top of the list and F fills up with no upgrades being processed.
Last flight I flew was SAT-DEN 738 and I was on H fare and got wait listed at my window. Plane sat with F empty, an F9 A9 P9 R1 for days, after checking in I was #1 on the upgrade list, and from check in time to boarding time, F seats start filling up, F inventory starts dropping, I stay #1 on the list, and the cleared list eventually shows 1 person on it when I got to the gate. I guess they sold 15 of 16 seats in the final 24 hours.
Same experience on pretty much every flight, though they usually process a few more than 1 upgrade. I am over it.