But I don't think they've ever eliminated a course when one was added. But I could be wrong.
Oakmont and the original best of par 3,4 & 5 courses are the only courses we've lost. Those best of courses were lost because they had Cabo & Whistler (trugolf) holes on them and it was around the time wgt stopped putting Cabo & Whistler on as free tournaments. I guess this was because the contract with Trugolf changed.