If it's just for the next season I'd let the old one finish the current one, but I generally dislike switching drivers in the middle of a season even though it means a little bit less experience for the new one. If it's a measure trying to rescue or improve the ranking in the team championship I might switch, as I regard the team one higher than the drivers one. Well, except maybe if I imagine the old one is a nice guy looking like the type of guy bringing some beer along, that is.
I mean, I did it once and it's not a very good idea because even though the driver that i put in the reserve had 65 points, the other driver managed to do not that much points in half a season (it was around 100). So, you better make your driver finish the season and THEN change drivers.
Once I've made the decision to get rid of a driver I do it immediately. If he/she is underperforming you've got to make the call, no point in paying wages and keeping a race seat filled with a rubbish driver if you have a better one in reserve.
Once I've made the decision to get rid of a driver I do it immediately. If he/she is underperforming you've got to make the call, no point in paying wages and keeping a race seat filled with a rubbish driver if you have a better one in reserve.