*Cough* - From wikipedia:
"On January 22, 1973, the Supreme Court issued a 7–2 decision holding that the Due Process Clause of the Fourteenth Amendment to the United States Constitution provides a fundamental "right to privacy", which protects a pregnant woman's right to an abortion."
The only thing that the reversal did was pass responsibility back to the US states to regulate. I'm not making any judgement on if it's right or wrong (I am not USAian) but facts actually do matter.
and: "thinking a law written in the 18th century on the right to have a gun, has any relevance in modern society."
It's not an 18th century law it's part of the US constitution. The process of changing the US constitution is not exactly easy (especially for this issue). From: https://www.whitehouse.gov/about-the-white-house/our-government/the-constitution/
"An amendment may be proposed by a two-thirds vote of both Houses of Congress, or, if two-thirds of the States request one, by a convention called for that purpose. The amendment must then be ratified by three-fourths of the State legislatures, or three-fourths of conventions called in each State for ratification."
Given that one side of politics has control over >50% of the state legislatures even if they can pass the proposed change federally they aren't going to get 75% of the states to agree.
If it was a law I expect that it could have already been repealed**
**But probably not since the democrats had a super majority during at least some of the Obama years and had control of the house and senate for the last two years and have always promised to actually codify Roe v Wade into law but never actually did it. You almost think that they continually ignored as a future wedge issue to fire up the base if ever reversed (they are politicians you know).
If that happened the supreme court could not have reversed Roe v Wade - or would probably have refused to look at it as it would have been moot if there was a federal statute that codified it.