I do not believe in such a scenario, it will mean an ETH capitalization of more than 10 trillion. Only if we are talking about 5-10 years, but it will definitely be not the same ETH as we have now.
Think this is the point most have been missing, it can surpass it in terms of market cap almost certainly but in terms of price that seems like too big of a price for Ethereum, not to mention bitcoin is unlikely to remain at 13-14k forever.