Seeing ETH pass through bitcoin's market cap is possible but for now I'm sticking to bitcoin and I don't want to say that it won't happen. But I'm pretty sure of that there are a lot of people that are holding ETH and Bitcoin, so it will be a rally against the supply of bitcoin and ETH. ETH's supply is higher than bitcoin but both has been great for this year and as an investment or currency, they will remain well after 5 years.