People, people. We are forgetting a sad but important fact.
Dinosaur's capacity is not being utilized to its fullest potential. It consistently has 10, 15 minute wait times. During the busiest weeks of the year, it rarely cracks half an hour. Yes, it is not a good thing for capacity to be reduced in any park, especially one as tiny as AK, but it's really not a significant amount of capacity. It would be like if Epcot was only Future World and they decided to close Living with the Land (Walt forbid). Yes, it would take away some capacity, but it's just not going to matter very much. Maybe waits at Avatar, Everest, and Kilimanjaro go up by 10 minutes, max.
I'm not trying to be overly positive here. I absolutely agree with the sentiment that Disney should prioritize expansion. But it seems to me from the general rumors flying around that this project is going to be immediately followed up by expansion anyway.
I know there is a lot of love for Dinosaur, but Indy is just objectively so much better (just watch lights on POVs!). And if Disney redoes the story to incorporate themes of preservation, and it seems like they will, then I think this is going to work out great.
All this to say that I don't think that Dinosaur closing is going to have very much impact on the capacity of AK. Pandora will still be open, and that does most of the heavy lifting anyway.