Although I haven't broken 100 yet, I definitely think that we need something a bit harder, but it should be after 40 at least, because titanium should still be a satisfactory high score.
Then if you didn't... would endless stop before you got to it, or would it just keep going in titanium? either one sounds horrible, because if it kept going, then you could get a higher score. If it stopped, then it wouldn't be ENDLESS.