The market capitalization of bitcoin is big and not even ethereum has the chance to overtake in the years to come. Any coin should first match the accomplishments of bitcoin to have the chance of defeating the top coin. You should instead focus on some quick rising coins in the top ten ranking because one of them might overtake xrp someday including ethereum.
I'm agree, the gap between markets is enormous, from 12Billios to 98Billions is just too much, i don't think ripple can ever fight VS BTC market. Maybe if it were a real coin, things could be different, but you know... ripple, the coin who doesn't have its core public.