Before Wells Fargo was built there was a plan out there to fill in the inner concourse with suites/seating and turn the voms around so the balcony would dump into a widened outer concourse. That would have upped the capacity giving Hilton a chance to compete with WF when it opened. As it happened they shot it down and the advantages of a larger WF capacity and location relative to the population center doomed Hilton to losing all of their shows to WF. A lot of tours liked coming to Hilton because Hilton did shows really well with good crews and easy access, but the additional seats (and additional revenue) was too good to pass up.
Imagine Hilton with a few suites and 16,000 seats crammed into that same size bowl. It would take crazy to a whole new level.