Then the unit that clients display and transfer will be nS (nano satoshis). Afaik, it's a very minor update to allow more decimal places.
Said every software developer ever, shortly before realizing that an entire ecosystem has been built upon X and any change would have to ripple through what is now our global financial system.
I'm still not convinced the change doesn't require a hardfork, which would involve switching chains, right? I feel like the possibility of hard forks being necessary hurts bitcoin as a "gold replacement"