Never. I have 6 drivers on my main account, all level 40, and when you put them online it freezes their arrow in their current position. So all of my guys are blue arrow. And I run the crap out of them in remote b-spec.
What I've experienced is this. If you hire a cold driver (slider towards blue) he does best if you get him in the front and leave him alone. If you hire a hot driver (slider towards red) he does best under pressure. For remote b-spec, you want hot drivers because the cars are very equal and the pressure is always there. My cold guy, who was awesome for b-spec in the game because I put him in "kill" cars, is the worst remote driver I have. My hot-head who sucked at in-game b-spec because I had to babysit him all the time, has the highest win ratio of all my drivers, was the last guy I hired, and has more wins than my cold guy who I've had since day one. But I'll never retire any driver on my main account.