There are two types of decisions made by SCOTUS. In the first type, they rule on Constitutional grounds, in which case it is binding to Congress. In other cases they simply rule on the interperatation of laws themselves; so if Congress changes said laws, the ruling becomes irrelevent. The law in question here is 'interesting' in the sense that it tells the court how to interpret the Constitution. If it ever gets brought up before SCOTUS, my guess would be they would deem the law unconstitutional on the grounds that Congress cannot tell them how to interpret the Constitution. Granted, they would need to find something in the Constitution (or precedent) that says this, but I suspect that would be relativly simple.