Trump could have inoculated himself in a more reasoned fashion without making it so personal. His performance was over the top - even for Trump.
Outside of the echo chamber that is FR - two of my co-workers (likely GOP voters) said they would not vote for him after the last debate. Both are veterans like me. I did not even attempt to defend him again - they have to make up their own minds. I am sure a few really liked it so maybe he gained as much as he lost - time will tell, but the real test of a great President is to win people over. If you win a few and lose a few you are in the same spot and I can’t help but wonder if he will ever learn the necessary art of politics that each great President has to master.
He is either going to win big or go down in flames with the rest of us screaming in the cheap seats. Not much middle ground with the man.
I suspect you're correct.