To say that ours is the shortest Constitution in the world is simply a matter of counting the words. But the consequence of all that brevity is that we don't really have clear instructions from the Framers and ratifiers of the Constitution on a great many topics.
Yes, the U.S. Constitution desperately needs to be updated. However, any updates should go through the amendment process. The U.S. Constitution may be flawed, but changing it outright is more dangerous.
With Supreme Court decisions resting on broad interpretations of corporate rights, local, state, and federal bodies are passing resolutions and introducing legislation that challenge the current narrative of undue corporate political influence.