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I suppose you could, but if you ever need to run a Repair Game (if on an Origin controlled install) or SuperPatch (if on a disc install), it might come right back or the file being missing might throw errors. I don't know how a Steam install might react to the file being missing. But personally I wouldn't bother. EP .world files for worlds I will never play or travel to don't take up much space or anything in the way of resources, I just leave them there and tend to ignore them in-game. Custom worlds that might have been there temporarily for testing of course are more expendable, as are EA Store worlds that are not going to get used.