Yes it could happen but i doubt very much it will happen the short to medium term, to actually make bitcoin obsolete would be a achievement.
Yes I agree since this is a currency which is expected not to be replaced any fiat but I see the thing will happen soon that some currency will sprout and be abovenitcoin if that currency is better than bitcoin, cause probably we will find the special features of it, comparison may come into our mind and it should be helpful ,accessible, systematic and decentralized as well, so expect that mamy more years some currency will sprout and be used, but I believe it will not occur ina short period of time.