Then it would be a new record which the king is being replaced by an Altcoin. Sounds impossible for those die hard fans of bitcoin but this thing isnt an impossible one which anything do have the possibility for it to happen.If people start to recognize ETH over BTC then this thing will surely happen where price might be over than on btc's. There are really some chances but i would say it would really much takes time to happen.No one knows since no one can predict the future.