It isn't just inertia, there's also decades to centuries of developments in currencies with stability being one of the core goals. There are also plenty of exam

It isn't just inertia, there's also decades to centuries of developments in currencies with stability being one of the core goals. There are also plenty of examples of the system failing when current best practices weren't followed, even when adoption has been high. The authorities behind the most popular crypto currencies today doesn't seem to be aiming for stability as a primary goal. The currencies would not be very meaningful as instruments for speculation if they were, which probably is the reason why stable cryptocurrencies aren't as popular.