He has lost many listeners due to his 3-hour Cruzinfomercials and daily anti-Trump rantings.
Cumulus is losing ad revenues as a result of the loss of listeners. This is bigger than Levin and proves he is replaceable.
I did notice that yesterday's Levin (1st hour) was very mellow, compared to previous weeks of rants. I figured Corporate had a discussion with him.
It was stunning. After Wednesday's tirade against Corey Lewandowski, I vowed "never again" but caught the beginning of his show last night, and it was fantastic.