Except modify the scenario such that jQuery announced a few years ago that will not be adding any more features and only doing sporadic bug fix releases, and they suggest moving all development to mootools. However, almost all code is written for jQuery and its not trivial to port libraries and applications from jQuery to mootools.
tl;dr: I don't think the Python2/3 : jQuery/mootools analogy is that fitting.
On the other hand, I still happily use Python(2) for some things, but that is primarily because of familiarity and awesome tools like what was mentioned in the article (namely Theano and pandas). Once the Rust language becomes more stable, I hope to move most of my development to that.
tl;dr: I don't think the Python2/3 : jQuery/mootools analogy is that fitting.
On the other hand, I still happily use Python(2) for some things, but that is primarily because of familiarity and awesome tools like what was mentioned in the article (namely Theano and pandas). Once the Rust language becomes more stable, I hope to move most of my development to that.