On the other hand, having umpteen other candidates all saying Trump isn't fit to govern might reduce that base. Then it would need each dropped-out candidate to endorse the most likely to beat Trump. That could be De Santis of course ...Trump has a solid 30-40% base who will vote for him whatever. Pence and Christie are just going to dilute the vote and ensure a Trump nomination.
Unless they can find a candidate who galvanises the field and picks up the 40 - 50% needed to unseat Trump as the candidate, the GOP could be dead and buried after the next election. I say could, because there is a LONG way to go yet.
Things are going to get VERY messy.