if ETH remains the same and nothing major happen with our crypto sphere, It is very likely for XRP to take ETH place before ETH makes an update.
there is a time before ETH making the major update on their system and will likely push the price up. before this happens, XRP has a huge chance to replace it for a moment.
These places depend on market capitalization, and they do not really show the "public" popularity of the crypto. Ripple managed to be the second one on the list, but it did not last long. Now, there is a great probability that this currency market price will go down slightly - the information appeared: Ripple CTO David Schwartz sells his XRP coins actively, so it might be also not the best sign.