Yeah, this could be true but it doesn’t change reality now. They have under capacity rides for over capacity crowds. The line skipping system helps people navigate that reality.
Even if they announced 10 new rides tomorrow, that doesn’t fix the problem for many years to come. And they aren’t announcing 10 new rides tomorrow. Building things is expensive and they have multiple parks to manage. That focus is never just going to be at WDW.
So for now, we still have to work with what we are given. And I don’t think any sort of capacity increases would guarantee 20-30 minute waits across the parks. Not with the way attendance continues to rise.
The definition of insanity is repeating the same behaviors over and over and expecting different results.
Genie+ is the THIRD line-skip system Disney has implemented at WDW, and it's failing right out of the gate. If we're generous, and allow $1 billion of the money spent to develop MM+ for infrastructure upgrades, that leaves $3 BILLION literally pi$$ed into the wind in attempting to artificially manipulate guest behavior and to avoid adding capacity.
Systems and data analysis are great, when they're not the sole thing driving decision-making. At this point, Disney leadership are addicts and systems and data analysis are their crack.
1) They KNOW they have crowding issues...but they're still spending a fortune advertising WDW specifically
2) They KNOW they have crowding issues...and have spent $3 billion trying to avoid adding capacity (not counting $1 billion for infrastructure that was needed anyway)
3) They KNOW they have crowding issues...and still have shuttered attractions and keep some dining locations closed or operating seasonally
4) They KNOW they have crowding issues...and rather than try to actually address the capacity problem, they keep attempting to manipulate guest behavior
On top of all of the above, they're taking away things that made the parks and resorts ridiculously popular and profitable to begin with. Introduced an obvious class system - check. Less staff at call centers - check. Ridiculously bad IT - check. No more transportation from the airport - check. No more fun Mousekeeping - check. Less spontaneous entertainment around the parks/resorts - check. Worse food quality - check. Less food options - check. People having their phone in their face all day - check.
ETA: And all this doesn't take into account the ridiculousness that is calling your parks and resorts a "luxury" experience while at the same time allowing them to become so crowded that the experience suffers in a huge way.
EDIT 2: And lets not forget reduced hours...less park hours available for regular guests...unless they're willing to pay for an after-hours event.