He sold out 6 shows at the London O2 ( which is larger than MadisonSquareGarden). His 90-show tour sold over a million tickets, some from repeat patronage.
In the THReporter story announcing the revival of The Music Man with Jackman, it was mentioned that it took around 3 years before Rudin could pin him down for the role of Prof Harold Hill. The only reservation is if he would want to be tied up with the show for, say, beyond 2021. He is not getting any younger and may not want to be away from his film career longer than 2021?