Once you realize the difference between... you will understand that unless some "external help" (like a government that issue a fixed price for conversion) it would be close to impossible that eth can flip btc.
If you understand the two in your research, there is no way you will not agree with the majority that Bitcoin is more valuable than Ethereum, because Bitcoin has gone round the world more than Ethereum which it will continue to make investors to continue to invest in Bitcoin in the nearest future. For you to agree with other people that said Bitcoin will continue to lead Ethereum in the general market, you have to use this current price in the market to differentiate the two, because the gap Bitcoin is using to gap Ethereum will make you to believe that Ethereum will not overthrow Bitcoin. Do you know that the number of investors moving to invest in Bitcoin daily are increasing more than Ethereum, because they know what they are going to achieve when they hold the Bitcoin for long term.