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Yes this would be a challenge for extension modules to implement support for this. Here is a discussion between the core dev and the numpy team: https://mail.python.org/archives/list/numpy-discussion@pytho...

It's going to be a bit of a chicken and egg problem, core Python will need to prove it's worthwhile for extension devs to implement, core Python will struggle without support from extension devs. We shall see.

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IMO, it was this sort of chicken & egg problem that slowed the adoption of 3.x in the first place. I know personally, I wasn't able to use 3.x for anything non-trivial until close to 3.7 because some of the 3rd party libs I needed weren't available. I seriously hope this doesn't happen again, though I am really excited for these improvements to CPython.

I don't disagree, but the positive thing about this is it's opt-in for extensions.

If extensions don't support it it means you just can't use that extension when trying to run multiple interpreters in the same process. Let's see if there's even a good use case for running multiple interpreters in the same process outside of embedded programming, it's not 100% clear yet.

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