honestly I think it depends on the cyclist and the situation. some athletes will understand that a crash is an occupational hazard and will jump right back on the bike and keep going as if nothing has happened. This group of cyclists is mentally tough and well prepared for any outcome. Failure is just a hurdle that will not slow them down, but rather drive them to train even harder. In this group of cyclists a crash is not going to affect their performance since they are already prepared mentally and physically to overcome it.
For others though, they will be unable to return to peak performance. for this group they might believe that they prepared, but for whatever reason the crash has sparked some sort of trauma. This could either be on a mental side, physical side, or both.