For some, sure. But for example a big stumbling block was the scientific programming community, from which I also stem. There were no major syntactical reasons

For some, sure. But for example a big stumbling block was the scientific programming community, from which I also stem. There were no major syntactical reasons there and yet people were up in arms, for the reasons I describe above. Most people I know migrated only when python2 literally wouldnt work for them anymore, like they needed a feature of a library only released for python3.