I love summer. The kids are out from school. The rumors fly hot and heavy.
Now, I don't want to say this isn't possible. The fact ToT and UoE have been taken over by the GotG should say otherwise. The fact that Disney's 3rd Gate MAGICal IP Park is losing its signature attraction for a short, screen-based ride themed to Mickey shorts from 2013 to now should again say anything is possible.
That said, beyond the fact it is a horrible idea that waters down the park's cohesive theming (something no 21st century fanboi seems to understand or care about ... it's amazing how these once were the volleys lobbed at UNI when Disney is worse about it as it is actively destroying the whole concept of theme parks), it still is very unlikely.
There ARE plans (as I have hinted at) to remove Dinorama and add a major attraction. I am not sure I would call them anything beyond proposed at this point. But removing Dinosaur isn't the same as removing Dinorama. The land is not Dinorama. And that will go, likely within the next half dozen or so years.
That said, I could see this being Chappie's own idea. And tossed at Iger, who would love it. So however unlikely, I would never say never ...