Air breaks down about once every 30 minutes, eventually it will cost too much to maintain. How often does nemesis break down, I don't know, I've never seen it break down or be out for a while. Oblivion also rarely breaks down (more so at the moment, but I'm blaming that on it being the only working (enterprise is down a lot recently) ride in x-sector).
The smiler, 13, air and Rita all break down (very) regularly. All of them will be outlived by oblivion and nemesis.
Also, eventually the world's first/world record feature will ware very thin on 13 and the smiler (and air to a lesser extent) over time after records broken, or more with the same world first element are created.