Agreed.
MM+ can really help manipulate package offerings.
Diminished personal budgets or even cautious budgeters might spring for Packages that include additional FP+ for certain stays, esp if discounted.
A deluxe stay could offer 10 (or more) scheduled FP+ per day, and in more than one park per day.
Some packages could include additional FP+ for FoP, 7DMT, Slink and Star Wars etc.
Those cost WDW Zero dollars.
Dining packages, shopping packages and room packages, will cost them money, but can still bring in more profits during slow times.
However, I do think a fairly major downturn could indeed tap some brakes on certain projects.
Crossing fingers it doesn't happen, and it least its all done before that happens.