This is definitely a possibility, however I see a few problems. Your queue goes through a wetlands area that the park probably can't build on. It would be more likely for a queue to follow RT's footprint out to Ka's tower. I also think the baboons need more space than what is currently available in Safari Discoveries. If you look at Safari Discoveries compared to the former Baboon section in the safari, the area in the safari is much larger. Finally, your plan doesn't show any new development at all in Rolling Thunder's footprint, which defeats the purpose of removing RT. I think if the park were going to remove a coaster for a drop tower, they would utilize the open land to the greatest extent to make the expansion flow well into the rest of the park. I don't think the park will go nuts creating many many paths leading to the drop tower but I do think they will add several paths to make the ride easier for guests to find and the entrance to be less cramped.
Alright, move the ZDOD queue next to the wetlands on the left side. I just re-read the announcement press release, and John Fitzgerald said, "Guests will be able to see the lively primates, also known as olive baboons, up close in their new habitat formerly known as Safari Discoveries" This means in the current footprint of Safari Discoveries. If the park were to expand it, they would've found some way to market it to the press ("newly expanded" perhaps). I think your area was a tad too large in the first place, and I just don't believe that the park is willing to remove Balin's Jungle just yet. I have a hunch that the park will re-develop Balin's for next year, along with reopening the Golden Kingdom Path so that the Baboon's have a new audience to attract.
I left Rolling Thunder's area like that on purpose. It's a blank canvas for future expansion. For an unspecified amount of time (to our knowledge), Rolling Thunder's footprint will remain like The Old Country - sitting desolate, closed off and waiting for development. You can quote me on this, because I STRONGLY believe the park will not create a series of paths in that back area for the time being. Maybe the park has some sort of plan for that area. GACoaster over at GAH speculates that the park may have removed Rolling Thunder (along with the rides age, cost, infrastructure, and dwindling popularity) to bring Hurricane Harbor into the park by placing a majority of the Water Park in the Baboon's old spot and the other part in Rolling Thunder's spot (he estimates the cost at being anywhere from 15 - 20 mil.)