Why have a law at all if you are just going to disregard it after the fact? The SCOTUS might avoid involvement - that remains to be seen - but they can't just wave their hands and say "oh, phooey!" and make the whole issue go away. They also cannot make the law unconstitutional. The Constitution gives the power to make citizenship laws to Congress, aside from the ones already written into the Constitution, and not to the Judiciary. Five years is five years, not 4 years 8 months and 6 days. Besides, to make the exception for Obama would ignite protests from the right, instead of from the left, differing only in the regard that we wouldn't be burning down or shooting up our own neighborhoods. But a march on Washiongton? You betcha'!
I don't know where Washiongton is, actually, so I wouldn't march there.