Long Term I think XRP will remain ahead of ETH, be that in no 2 spot or lower. Short term ETH could easily pass it with some point. The main reason I think XRP will remain higher is that it has real world adoption, even if the currency is a long way from being a true cryptocurrency.
XRP is now the main attraction on centralized banks across the globe and if this continue then i guess XRP will remain on second spot unless ETH have a good news or partnership coming.