You can't speculate whether he'll return to his normal ability again, just because some other b-grade drivers lost their confidence, which is debatable anyway - perhaps Nannini and Herbert just weren't that great to begin with.
Schumi and Lauda didn't lose anything after their big crashes. Kubica already had a big one, and didn't lose any speed.
It's more likely he might lose some confidence in rallying, not F1.
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