BTC is the ultimate store of value coin with a fixed total supply and the same does not apply to Ethereum so it is not going to pass BTC ever.
Yeah, BTC is better than ETH and looking at the market its too impossible for ETH to go beyond bitcoin. This is an example of too much speculation. ETH is great coin and its good in his current position, even if this coin continues to make new developments, still no one can beat bitcoin at the top.