Technically, the profits go into the company, corporate pockets, and shareholders but it also takes a lot to run the parks, develop new stuff, and plan long-term. Yes, it takes Disney a while to build anything, not just a roller coaster. Avatar's land and rides took forever. MMRR is one of the fastest and even it is taking a solid two years. Their pace is glacial but, since the crowds continue to pack, they have no incentive to do otherwise.
Also, I realize that not everyone likes a roller coaster but I would bet that this coaster and Tron will both be extremely popular. 7DMT remains a long line (although, I'm not sure if that is capacity or popularity). The parks have to have a broad spectrum of rides and that includes coasters. Disney has a wide assortment although I do wish that the older peoplemovers still existed, although refurbed and refreshed as needed.