Bitcoin as it is now is evolving and will evolve more in the future. It could happen that some other currency replace it, but it is not probable and is not as if Bitcoin will stay just the same while others become more and more sophisticated.
Well, that sounds ridiculous by the time bitcoin be replace with other crypto currencies because no other currency of todays era that has been performing like that expensive price. If you said that evolvement of bitcoin is to be replaced with other promising one, then it's worth to invest for if ever there's a plan to replace it in the future.