yeah that was stupid of him no argument.
as for the film i'd say it did well. it has to be near complete in terms of theater showings worldwide. last i saw it was beyond 750mil which is pretty strong and a success IMO. throw in how it ended (post-credits scene) and the door is certainly open for part 6 although i wouldn't expect it for a good 3 years or 4.
if it were up to me, assuming depp relaxes a bit with the off-screen problems, i'd come back in 2020 with keira, orlando, and (no spoiler) the big bad guy who shows his face during the credits. throw in depp and the two kids from the new film and market it as the REAL last pirates film and go out with a bang. i bet it'd do at least as well as this one did.