Don't confuse land area with the number of attractions. Look at that photo. Now, list all the attractions that were in that space:
1. Back Lot Tour (which closed a year earlier and was no longer a tour of active filming)
2. Lights, Motor, Action
3. a playground
And that's it. Is that list half the park? Streets of America was an area, don't know anyone would call it an 'attraction'. The flex Theater wasn't really being used (last time was for the temporary site of the Frozen singalong). Then there was a QS and some kiosks. Who's crying over a cafeteria?
So much of that space was dead space: They had alreadyclosed Back Lot Tour and demo'd an actual back lot and SoA.
Since the construction, WDW has added:
1. Star Wars fireworks (and let's point out how big a deal a nightly f.w. show is)
2. More M&Gs than were lost.
3. 2 Star Wars hub shows with multiple showtimes.
4. Pixar Concert
5. Disney Movie projection show
6. Christmas projection/f.w. show (now in addition to the SW f.w., and not replacing it)
7. Upgrades to: TSMM, Jedi Academy
Anything else that was closed was replaced: Millionaire -> TSM; Idol -> Frozen singalong; Animation Academy -> Launch Bay
So, while half the acreage may be under construction, any claim that half the attractions are gone are false.
Now, if you want to count just 'rides', then when Back Lot Tour closed, DHS went from 6 to 5. The massive construction didn't touch any other 'rides.' When TGMR closes, then DHS will go down to 4 rides. (Note: 4 is not half of 6.) In nine months after TGMR closes, then TSL will open, and the number of rides will be 6. And a year later when SWL and the Mickey Ride open, the number of rides will be 9.