There seems to be a common theme here, that usually when one party says no after one date, the other party also said no.
That would seem to indicate that a shidduch is not going to make it and it is best to move on for all concerned.
The problem is when one side wants another date and the other doesn’t. It may then be worthwhile for both sides to agree in advance that if one side wants another date, the other side is obligated to go out again.
This may seem radical on the surface, but it would most likely stop many good shidduchim being ruined prematurely.