one was to fail the upgrade they wouldn't keep "the job" would they
my point is that you need to get through the interviews, the cadet program, ground school, LFUS, being checked to the line, annual line checks, numerous simulators before you even have to worry about a JFO upgrade. yes, if you believe you're not going to get through an upgrade, then dont apply. However, there is alot of water to go under the bridge before you have to worry about it. you may not even make it through the interviews.... enjoy the ride! you will get found out, soon enough, if you are not going to get through a JFO upgrade.