True, currently Solana (SOL) has about $83B and Ethereum (ETH) has almost $400B, although almost 5x multiples, but it makes more sense that Solana will catch up to Ethereum than Ethereum chasing Bitcoin (BTC) which has a lower multiplier from the MC side.
From the marketcap it is more likely for SOL to chase ETH, rather than ETH chasing BTC's marketcap, but apart from that some people trust BTC more as a place where they keep their money than ETH in the crypto market, because it is like the ultimate goal of the investment journey in altcoins.
I've heard some great people in this industry, they play and invest in altcoins then when they have made a big profit from altcoins they will save it in bitcoin and that's how they survive the bad hall and full of altcoin risks, therefore bitcoin will never be passed by any coin, except in the previous few cycles it was beaten by XRP in terms of marketcap.