Here's the thing. The SEC is currently reviewing filings for Bitcoin to become a legitimate financial investment through ETFs. It failed the 1st time, but it is currently being reevaluated. Here's the catch though, the SEC is also reviewing filings for Ethereum ETFs and has already made numerous statements hinting that Ethereum is ready for primetime more so than Bitcoin.
If BTC gets rejected a 2nd time, which is a relatively probable outcome, and ETH gets approved, we can all expect to see a lot of sell pressure coming from BTC (and likely a prolonged bear market) as a paradigm shift takes place.
This is all speculation of course, but one needs to be prepared for all scenarios. I hold some BTC due to sentimental value to be honest, not as an investment.