I fly with a very sharp UPT washout at FedEx. He went on to serve as a Marine and then got his ratings on the outside. Outstanding person and pilot.
UPT is about how quickly you learn, not how good you can get. In some cases RTU is similar. But time is money, and at some point you have to draw a line. I think there are some guys I know who should have wings and don't , and vice versa.
But in any case...game ain't over. But you need to be honest about where things went wrong and do all you can to fix them.