The ERA is much like the proposed Child Labor Amendment. In theory, it would desirable, but in practice I fail to see where it is needed. What exactly would passage of an ERA do that isn't already being done (or least is doable by Congress if it chooses to act)? I can't think of anything.
Sex/gender discrimination is held to a lower standard of scrutiny than racial/ethnic discrimination, and the ERA would fix that.
And what specifically would that technical change in the standard of scrutiny applied actually affect? I can't think of any situation in which a law passed today that addressed racial discrimination would not also address gender discrimination.