As a result, I believe noncompetes in M&A transactions will continue to be enforceable. I also understand that the new rule does not prohibit nonsolicitation provisions (a common restrictive covenant preventing a person from soliciting customers or employees of his or her former employer).
I also agree with you that if noncompetes become unenforceable in M&A, then the value of a seller's business will be diminished. This is especially true in a service business like medical or dental. Seems like a double edged sword for the doctors.
It should be obvious, but none of this is legal advice.
Lack of non-solicitation agreements / clauses would very much disrupt the M&A market as well. It's very difficult to protect a newly acquired asset if it can be cannibalized shortly after transfer.