I dont think Petrov is doing too bad. where as I expected more from 'Quick Nick'. It doesnt help that the car has slowed down compared to the top 4. I would like to see bruno do a 1 off race but 2 rookies in the team full time is a bad idea
Depending if and when Vettel wraps the championship up I think most teams should give reserve drivers a couple of races towards the end of the season - certainly Senna in Brazil and Chandhok in India.
3 drivers are fighting for the number 2 spot. Robert will be head honcho when he comes back. As for this season, I can see Bruno maybe getting a drive later in the season.