That would make sense, but not in the world where Disney is a business. That makes sense if Walt was still at the helm because he loved perfection, profits and finances be darned. Disney is a business now. If you're Disney and you're spending less per capita than you were 3 years ago, but your parks are literally busting at the seams, what sense does it make to invest more?? They care about the bottom line, not guest happiness. You know when they'll give a lick about guest happiness? When the parks are seeing a massive decline in attendance. Until then, they won't spend a penny more than they need to because they don't have to spend money to attract the crowds. The crowds are larger than they can handle, so no reason to spend, expand, or anything like that.
Btw, I'm not agreeing with this approach if you haven't picked up on that. I'm just stating fact. Actually, when they DO invest in the product, it literally shocks me because it makes no business sense.