Well, no, if you have enough isolation then the virus runs out of hosts. It goes extinct unless it can survive latently or in some other host species. If we are getting infected by bats consistently then we are in trouble.
As I mentioned above, we have only ever erradicated _one_ infectious disease in all of human history. The chances of COVID, with its highly infectious nature, being the second are quite slim.
Just like the first outbreak, all it takes is one person with the virus to start the whole process over again.
All international travel is going to be restricted for a very long time regardless of antibody and PCR tests.