"Looong game?" Not really. No publicly traded company does. The focus is almost entirely (and frequently not so smartly) on year over year growth. That's what drives the stock prices.
A project of this scope was absolutely approved based on how much it costs vs when it would break even and when it would be profitable, and if it was presented as, a "looong time from now," it wouldn't have been undertaken. There is a certain amount of time this level of expenditure can be amortized over that would make financial sense, but not much beyond five years.
And, as I've also said before, increasing per guest spending is definitely a goal, but not as big a one as getting new people in the parks. There is a finite limit on per-guest spending and Disney has already exploited that market about as far as they can. They will continue to creep it forward, bit by bit, always pushing right up against what the market will bear, but that's a game of inches at this point, not yards or miles. You're not going to see 25% or 30% growth in spending numbers. It's just not possible.
Adding a new land and increasing attendance 25% HAS been proven possible. Someone, somewhere had to have a sheet that showed MyMagic had a comparable return on investment to Carsland to get it approved and funded. Admittedly, the returns for the California Adventure expansion outpaced predictions, so I'm not saying they ever thought MyMagic/FastPass would be in that 25% range, but they were certainly expecting SOME kind of immediate bump to start paying back that billion dollar cost. So far, that hasn't occurred.