The copyright on Right You Are If You Think You Are (or what ever title is being used, I have also seen it as It Is So If You Think So) expired long ago. Perhaps so did the translation that Randall's company will use.
I think it has nothing to do with Who? as opposed to How much? Its always money.
Pirandello had a brief but definite resurgance in the 60s but no major NY productions since. Let's wait and see how this will fare.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher