Ummm... Avengers Campus completely rethemed one ride, and killed 3 other rides (one transferred to the Pier) and It's Tough to Be a Bug for just one new ride (a second to be named and built much later).
In WDW, TRON and Ratatouille are new and not replacing other attractions. Cosmic Rewind added to the footprint of attraction-space with its new gravity building. Soarin' added 50% to its ride-space.
In DHS, TSMM added 50% to its ride-space. Four new rides were added with TSL and SWL, replacing one ride and one stunt show.
Altho, Stitch and Primeval sitting empty isn't good.
All in all, DL and WDW pretty much have the same number of rides, which has been the case for the last decade, and as far as we know, will continue to be on par with each other ride-wise for the next half decade.
All that extra space in WDW is taken up by hotels and golf courses.