I doubt that this will happen.  IMO BTC has proven itself to be the King and leader of crypto world and that will not change anytime soon.  If any alts would seem to unseat btc, markets like the one we have now and have had for the whole year would be the ideal situation to make a move but as we can all see, when BTC sneezes, alts catch a cold.  Already several BTC forks and none has come even close to 50% of btc’s Value.