You somehow seem to think that amount someone earns is somehow related to how good they are.
> $11k/mo is realistic. It's already a large pay cut.
Yes, sure, in Silicon Valley anything is possible but for the 99% rest of the world, 11K USD per month is ridiculously high and even people with decades of experience won't collect that unless there is a specific situation. It's definitely not normal outside of Silicon Valley companies.
> Are all those people capable of managing Babel?
Yes, I know of at least 10 JS developers with decades of experience who could handle maintaining Babel if it was up to them, and they don't earn close to 11K USD per month today. I'm sure they'd be happy to work on Open Source and effectively earning more, but many be happy just working on Open Source full time.