I dont think that there will be new crypto that can out-ranked ethereum as the top rank altcoin knowing that it really dominates all the altcoins in the market. But if there is an altcoin that can out-rank ethereum, I am totally confident that it is RIPPLE(XRP) which was happen about a year ago.
We do not know what will going to happen because everything in the altcoins can possibly happen. Why? even though ETH had already expresses that their upgrade is good and that their network now is fast and reliable other crypto like chain link progressively grow over a period of time climbing up to the rank slowly beating other crypto in the rank listed at coinmarketcap.com. Other coins like the uniswap, YFI which has been pumped by whales could be something a very interesting coin.