If your primary concern is the base you get, you shouldn't be an airline pilot! Bases come and go all the time. No one thought CLT would close. Most people, if they are going to fail, it's going to be in the sim. The sim flies like Microsoft flight sim, as in, place the attitude indicator on a certain point, it will do the same thing every time. If you doubt your sim abilities, go play flight sim for about 10 hours flying ifr, doing maneuvers without the use of autopilot. It really helps. And as others said, not everyone can do this job.