Anybody who seeks to lead Republican party will meet the same treatment and fate faced by Trump. Democrat/Deep State establishment will subject that person to 24/7 demonization, politicization of every little thing, witch-hunt and character assassination, and RINO will join the fray such that he will end up fighting his own RINO/NeoCon wing of the party besides Democrat establishment and Deep State. What makes you think giving up on current GOP leader will not invite same the fate on new GOP leader? Trump is a fighter. Why would you give up on a fighter in favor of someone who talks conservative but compromises and surrenders to Democrat establishment? GOP is fractured due to RINO and Neocons. It is too easy to blame Trump.
Almost anybody else will deal will that in a professional, rational, and uplifting manner.