Mike Barrett said: "With all the financial success on the play side too, I can’t imagine there won’t be at least 1 segment dedicated to it. "
None of the nominated Best Plays have been financially successful, so I don’t know why that would be a factor? The most financially-successful plays of the year (Network, Mockingbird, American Son, Lifespan/Fact) weren’t nominated. Constitution is a minor success considering the size of theatre and subject matter, but that’s minuscule compared to the musicals.
2016 and 2017 were also excellent years for plays (I’d argue even better than this year), so I wouldn’t expect them to give a second more airtime to this year’s shows.