Everyone talks about how Disney wants to get out of the IP deal with CBS for ToT, but come on, how much can that IP be really costing them. Twilight Zone has next to no relevance today other than reruns on MeTV. If CBS is getting $100,000 a year for use of that IP I would be in shock, which is a pittance. And even so, if they wanted to get rid of it, they could cut out the Twilight Zone references pretty easily since they are entirely on video and audio cues, so you could change it to ToT without the TZ.
But in the end, here's what you need to remember...Disney could have easily pushed to do the GotG overlay on ToT in Orlando same as Anaheim, but they didn't. Instead they decided they'd rather spend $200+ million to get GotG into Epcot. That right there tells me they didn't really want to change the ToT to something else. They could have easily saved a big pile of money. Instead they are keeping it. Now, maybe that is related to DHS being almost bereft of things to do, but it still says that ToT is likely safe well into 2019. And even beyond that, once SW:GE opens, they'll still want rides in that park to handle the overflow. So I just think it doesn't make any sense that with where they are right now that it's going to change anytime soon.