> "improvements in math might happen" is not reliable enough to calibrate forced obsolescence or regular updates Definitely: it doesn't make much sense to move

> "improvements in math might happen" is not reliable enough to calibrate forced obsolescence or regular updates Definitely: it doesn't make much sense to move away from a hash that doesn't seem in danger of being broken, just because it is old — a clever new attack can be found for a newer hash, too (or for both). Besides, usually there's a lapse of time between finding a major weakness and a practical collision. On the other hand, when picking a hash… well, having a faster and less error-prone hash is nice. Overall, I feel lucky to have such great choice.