At this point, if they still can't make up their minds about what to do with the space......just bring back Alien Encounter.
Yes, I am fully aware of how it was too scary for the MK, but I'm sure this is something Chapek would probably be interested in being that it would be really cheap to do (At least compared to a big new ride), and it would garner a lot of buzz from Disney fans for bringing back a cult classic for a new generation.
I'm sure this post will age like milk once D23 is announced and it will probably be some lame Wreck It Ralph attraction, but if the infrastructure is already in place and there's really nothing else you can put in here.....maybe you can let DL bring back the People Mover and MK Alien Encounter. I'm no expert on design or cost-analysis, but I would imagine something like this would be way cheaper than trying to convert this into a Wreck It Ralph attraction. Besides, it would definitely sell merch.
Worst-case scenario it would buy Imagineering more time to come up with a better plan for the space. I would love to have a chance to see a new version of AE as I was too young to be able to experience it when I went when it was open.