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Sounds easier to make a human shaped robot than to make something else than can climb stairs as well as do everything else needed efficiently.
Maybe a different shape would be fine if they never needed to climb stairs or go up and down curbs, like rolling around everywhere, which we already see in some restaurants with the little programmable serving robots.
I agree with copyright in a sense that people should have a chance to profit from their ideas before it gets stolen, but you are right that it is way too long of a term. It stymies creativity when people can milk the same idea for many decades.
I would think for creative license like an idea for a cartoon or comic, 10-20 years is more than enough. Then they should try and make new characters or start competing with others trying to improve the character.