Until it reopens, all we can do is speculate. I can't see them getting rid of the theme and name all together, but certainly it tone it down in many ways like some have suggested already. I think they've only removed the sign just to keep quiet and hope for no photo opportunities from anyone, which I can't really blame them really.
Though that said, if it does open say next year with the current name, would any of the GP remember the incident? Hard to say during this time, the Smiler brand is a fairly well known brand to many and getting rid of it altogether would be quite OTT for a PR persective. Then again I suppose people like to get attractive by controversy and Smiler may get this infamous reputation that, as crazy as it might sound, might work in it's favour.