The Music Man has several nominations, including Revival, Actor and Actress. Surely they will have a number featuring Jackman on the telecast that CBS will promote heavily. The big question is if Funny Girl will do something with Beanie featured.
But your overall point stands. This year's crop is exceedingly unlikely to do anything to reverse recent ratings trends.
It wouldn't affect viewership, but my Tony wish is to see is Ariana Debose, Chita Rivera, and Rita Moreno jointly presenting Best Musical (or something).