[formerly_proven]

Presumably this also means readline (GPL) is no longer required to have any line editing beyond what a canonical-mode terminal does by itself. It seems like there is code to support libedit (BSD), but I've never managed to make Python's build system detect it.

[zvr]

I have managed to build Python with libedit instead of readline, but it was a custom build.

If your assumption is correct, then I'm anxiously waiting for having the default Python executable in Ubuntu, for example, being licensed under a non-copyleft license. Then one would be able to build proprietary-licensed executables via PyInstaller much more easily.