It makes no sense for the Equal Rights Act ratification process to start fresh after 37 states have already expressed their approval for it. This is especially true in light of the fact that other Constitutional amendments — most notably the 27th Amendment — have been allowed to pass long after their first proposal. The ERA would provide important protections for women’s rights and equality, and should be ratified as soon as possible, now that Virginia’s state legislature has committed to taking it up in January 2020.
When Congress self-imposes a time limit on the ratification of a constitutional amendment they need to stick to it, even if it means the process has to begin anew because it wasn't ratified on time. The ERA could potentially regain the support it had once the process restarts. More broadly, there could be unwanted unintended consequences of ERA ratification, such as forcing women into the draft, eliminating single-sex bathrooms, or weakening restrictions on abortion.