If transaction malleability and ASICBoost were unforeseen, unintended outcomes that were not apart of Satoshi's contemplated "economic ecosystem" – and as far as I know, this appears to be true – then SegWit represents a return to Satoshi's original vision. SegWit is a return to aligned incentives among the entire ecosystem before the discovery of both of these "vulnerabilities."
The question is whether the misaligned incentives are now too strong to divert. This issue will determine whether Bitcoin is antifragile or fragile. If Bitcoin cannot withstand unexpected misaligned incentives, then it is fragile. If it can course correct back toward aligned incentives, it is antifragile. I would argue that any outcome that results in the sustained existence of two versions of Bitcoin is a characteristic of fragility.