Let me say that this is a well-recognized and common disorder. The exact treatment for a particular couple varies a great deal, depending on the details, which are not available to me in this circumstance. A single number is probably not really meaningful without the details. In general it only takes a day or two to accomplish the procedure. Generally, the chance on subsequent cycles is the same as the first.
Chance has no memory.
It is the same situation. It is quite clear that the evolutionary process is difficult to measure in a single lifetime or indeed in a single century. But I think if we are talking in terms of a million years, the answer would be yes. I don't think from an evolutionary process that we can foretell if something is good or bad. It has to do with whether the survivors survive.