How on earth will that happen becasue of the size of Ethereum on the coinmarketcap. Basically, there were many few days or weeks that Ripple was able to defeat the said Ethereum but the good news about this happening is that, whenever Ripple is be pumped, it price goes up, not necessarily mean that, it dethrone Ethereum.
It's just a work of those big fat whales who fully understand how traders and investors select this prospected project, there's no chance for ripple to defeat btc, if there's a huge pumped for sure a large amount of money whales bring inside to attract traders to buy in then take the opportunity to grab money from fomo's investors.