"A new Emerson College Polling survey of U.S. voters following the August Republican Primary debate finds half of Republican Primary voters (50%) plan to vote for Donald Trump, the lowest support to date for the former President in Emerson national polls. Trump’s support has dropped by six percentage points since last week’s pre-debate national poll." -- Emerson Poll 8/28/23
This is just one data point, a year before the nominating convention. Still, it's interesting, because until now, Trump's support among Republicans has only increased with his multiple indictments.
The change in a given poll's numbers is a more accurate indicator of the state of play than the poll's numbers themselves. A 6% drop in support of a candidate in one week in the same reputable poll is nothing to sneeze at.
Keeping Trump off the Republican ballot is the first line of defense in saving the country. The second -- and much more likely -- means of avoiding Armageddon is Trump losing the general, but while this is likely, it's far from assured.
The third way is disqualifying him from being president under that clause in the 14th Amendment that's being advocated by some prominent conservative Constitutional scholars. This is the least likely to succeed but everything needs to be thrown at the impending catastrophe in the hope that at least one will prove successful.