A lot of folks I have read and admired for years on that list. There will be more.
My favorite conservative commentator for many years has been Peggy Noonan, and I await her column each weekend with trepidation that she will drink the Kool-Aid. I'm afraid she's inching closer - don't do it, Peggy!!!
I guess a good working definition of "establishment" GOP is those will bend over for Trump. It remains to be seen how many - and the response of such folks as Bush, Cruz, Rubio and Kasich will help guide me as to whether to quit the party.