Definitely keep the name if it's just a matter of some internal reworkings. I would say keep the name until the overall purpose of the addon changes. (eg if it becomes something other than a complete UI replacement) If you look at some major applications such as operating systems or web browsers, they overhaul their designs every now and then. Well, maybe if in a new version a user would have no chance of recognising it, it might be time for a name change.
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