Well i think for the Marketcap who will pass the Bitcoin, it could be XRP. Why not ETH because the movement about marketcap ETH was really slowly. Sometimes XRP can beat the position 2 of ETH.
I don't think that Ripple can pass bitcoin in the long run when it comes to marketcap as this ripple has huge circulating supply that needs huge money to beat bitcoin in the top position, not unless bitcoin will fall down due to some negative issue. For the next 10 years bitcoin is still a valuable crypto that has trust from the traders and the crypto community.
We need to decide on how exactly we can see the real leadership in the ripple cryptocurrency market. If we talk about capitalization, then everything is possible, because the cryptocurrency market has already shown its unpredictability. But if we talk about coin prices, the ripple will never be the market leader. TO