Yes. This is very common. Many trainers at clubs here in Sweden are ex-pros who never made the top-200. Even some retired top players work as tennis trainers.

Yes. This is very common. Many trainers at clubs here in Sweden are ex-pros who never made the top-200. Even some retired top players work as tennis trainers. So this escape route exists. Another escape route where you don't have to abandon tennis and still have a chance of going pro is to play at a college in the US.