As much as I believe there is a plan, one competing among many, to ditch Tiki, I'm not going to get worried it is imminent unless we hear what the replacement will be. As others have pointed out, the Tiki space is tiny. A new Club 33 isn't going to fit there. A spinner will barely fit. So, it's certainly not going to be a D or E Ticket, which takes the wind out of any reason to change it.
The problem with Tiki's emptiness (at non-peak times of year) is also the problem with CBJ, People Mover, and CoP: They don't show up on the Disney App in the Wait Times list. That's what people check to see where they should go to next if they don't have a FP and if they don't want to wait an hour: "What has a short wait line?" And these attractions don't appear in that list, so, they get often overlooked.
The problem with Tiki's emptiness (at non-peak times of year) is also the problem with CBJ, People Mover, and CoP: They don't show up on the Disney App in the Wait Times list. That's what people check to see where they should go to next if they don't have a FP and if they don't want to wait an hour: "What has a short wait line?" And these attractions don't appear in that list, so, they get often overlooked.