Let's assume that we expound the reasoning behind the pesukim for the sake of this question, a matter which is a dispute between R' Shimon and R' Yehudah. Let's also assume that I don't get put in cheirem for asking this question.
Polyandry (also known as eishes ish) is forbidden as a capital crime, because it would be unclear who the father is, which can lead to all sorts of issues, such as Kibbud Av and arayos (Sefer HaChinuch Mitzvah 35).
Nowadays DNA testing is possible, and with a little swab of saliva it's possible to determine who your parents and ancestors are. With this technology, this reason is a moot point. According to R' Shimon, therefore, would eishes ish be permissible nowadays?
(This is all a theoretical question. I am not assuming that we pasken like R' Shimon. All I am asking is, given these assumptions, is my conclusion correct.)