To the extent that it's "a python2/3 situation"... Isn't that exactly what it is now, too, then? If you have a big change to do and postpone it "because of the

To the extent that it's "a python2/3 situation"... Isn't that exactly what it is now, too, then? If you have a big change to do and postpone it "because of the installed base", then that just makes it worse the longer you wait. (Unless of course you're counting on your user base to shrink over time.)