I presume the same was said about the likes of Piquet Jr, Nakajima, Bourdais, etc. "Give them one more year and they'll come good." A couple of good performances don't change the overall picture, the general trend has shown that Petrov hasn't been able to improve during his rookie season unlike the likes of Hülkenberg, Kovalainen, etc. IMO Petrov is pretty much in the class of the Piquets and Nakajimas of this world. Perhaps it's time for Renault to stop gambling on underperforming rookies. Considering their position in the pecking order, they need two drivers they can rely on being capable of accumulating decent amount of points. If they fail to get Räikkönen, I'd certainly try to sign someone like Sutil or Glock.