Like he said he has good connections with most teams, because he's a good people person and has great developing skills (So people in the know say) so or though he's lacked something on the track it seems he is able to offer vital feedback to teams, which could potentially keep him in F1, his people and feedback skills.
Maybe next year he will improve when it really matters, as he was doing fine against the Hulk for the first half of the season. He just needs to get the results when it matters to beat his team mate (Latter in the season)
He was and has done that in the 2012 season, often beating the Hulk, but the second part of the season he seemed to lack that killer edge consistency.
The later part of his comments made me wonder, especially as I agree with you about the 2012 season. Di Resta admitted that his form hadn't been great in the final races of 2012 but hopes Force India will benefit from switching attention to next year's car at an early stage.
"The end of my season wasn't great. We had mechanical issues, a chassis change, and ultimately the style of my driving did not suit for the last few races. Overall, I had ups and downs, although there were still some very big positives. We got very close to being on the podium in Singapore, where we felt we were slightly robbed when a safety car came out because it was in touching distance there.
"Our performance slipped after that as we didn't develop at the rate of other people. All I can hope is when we switched off on this year's car it will pay dividends for next year in terms of our performance in Australia."
Force India struck me as being a team on the upswing toward the end of the season. They progressed more IMO, Sauber would have been the team that I would have described as starting stronger, but apparently not developing as much as some of the other competition.
Going back to Singapore, he finished 4th. Hulk followed that with a 7th in Japan, 6th in Korea, 8th in India, Di Resta had a 9th in Abu Dhabi with a 1st lap retirement by Hulk, 8th in Austin, and Hulk ended up 5th in Brazil after dicing for the win for an extended period.
If by "our performance" he means "my performance" slipped late, I wouldn't disagree, but if "our" he means Force India, I can't agree that it was a weak finish to the season as the last stint, they were definitely punching above their weight toward the end.
I guess part of what bothers me, is I really respect what Force India has done, and he seems to be more focused on personally reaching a higher rung on F1's ladder with someone else, than driving his current seat to a higher spot. Which given the competition for seats and who apparently will be without seats next March, that probably is a better focus. Certainly, I don't think I'd be very flattered if I were his bosses at FI.