Well, yeah, Bitcoin or crypto in general will arguably be the best performing assets in your portfolio if you compare your capital as of today with your capital as of 4 years from now. This is so regardless of wheter Bitcoin will replace gold or it is a Ponzi scam. Yet even the most faithful believers should keep in mind that there still is a possibility of Bitcoin never seeing $20k again - to me it is highly unlikely but just in case you're considering selling your house to hop in the crypto train, don't.