It is a (possibly flawed) feature of the US Constitutional form of government that there is a proper channel for adjusting the enumerated rights in it, and that process is via amendment.

I'd like it to be otherwise, but this Court has demonstrated in its overturning of Roe v. Wade that the risk of leaving it up to SCOTUS to synthesize "prenumbrae" and rights to privacy (which would have not been a thing anyone would have written in the 1700s) is that reasonable people can disagree on what those things are, unless you write them down explicitly in the document that requires a lot of effort to change.