Rameses Revenge will operate for as long as is viable. Much in a similar way to Safari Skyway. It'll run until the park can no longer see it as worth while to repair, or it becomes condemned due to safety concerns, which can be the case at some theme parks.
Safari Skyway has been on it's way out for a couple of years. Now the park have finally got the time (and money) to properly invest into ride maintenance this season, they've realised that it's just not worth the huge expense on new trains, new sections of track and of course some foundations need work. Why spend all that money fixing up a ride that is past it's prime, when a suitable replacement with a higher throughput, a new route (more in keeping with the zoo) and of course a much more reliable transit system can be found? It's nonsensical to fix what cannot be fixed much longer. Rest in Peace Safari Skyway, may you go to Theme Park Heaven.