Is 3.0 worth breaking backward compatibility?

[walterbyrd]

IMO: breaking backward compatibility is a big deal, and should only be
done when it is seriously needed.

Also, IMO, most of, if not all, of the changes being made in 3.0 are
debatable, at best. I can not think of anything that is being changed
that was really a "show stopper" anyway.

At best, I am a casual python user, so it's likely that I am missing
something.