I also think the python 3 transition came at a bad time. There are a lot more strong alternatives to python now than there were when the transition was planned

I also think the python 3 transition came at a bad time. There are a lot more strong alternatives to python now than there were when the transition was planned so putting up with the hassles of migration is enough for some people to consider how green the grass might be in another field. Guido always said he could only afford to break python once but it's not clear to me he'll even get away with once.