The problem with this approach is that it is very malleable. Technology also changed immensely from when the Founders mentioned "arms", but I would think Conservatives would have a hard time accepting this particular "evolution". The examples you mention are also cherry-picked. We already knew fetuses had heartbeats and human faces many decades before ultrasounds existed. And a vast majority of scientists would agree that abortion is valid within some restrictions, so I don't believe that ascribing this change to the evolution of science does you any favors.

> On that question, the science changed dramatically in the period leading up to 2015. Science proved in the late 1990s that same-sex conduct was not a choice to reject conformity, but was rooted in biology. And in the early 2000s there was the first research showing that same-sex couples were living in committed relationships, raising children, etc. You'll notice that Kennedy spends a lot of time talking about these facts in his opinion--because those facts are critical to showing that same-sex relationships can be called "marriage" as historically understood.

Homosexual "marriages" have existed since Antiquity. And marriages do not necessarily have to lead to children, otherwise old people would be restricted from marrying. I think it is obvious that this decision is a result of the fast change in the zeitgeist rather than a careful evaluation of evidence, no matter what the Justices or their clerks deemed fit to write in their decisions.