Your thoughts are based on a lack of knowledge about the nominations process.
Only ORIGINAL direction and choreography are eligible for a Tony. Recreation of such in revivals are not (ie WEST SIDE STORY, A CHORUS LINE, etc.).
Last season's PIPPIN, while a revival, had completely original direction and choreography (with exception to the 1-2 musical numbers that they credit Bob Fosse for).
There does not need to be a new category. There are not enough revivals each season to warrant such a division, anyway.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle