No, the Constitution should remain as it is because the only changes possible today will be at the behest of the people who control the politicians... i.e. the big monied interests.
As flawed as it may be, it needs to remain inviolate unless some glaring problem is found (which is why the change process is included).
What REALLY needs to happen, however, is that the U.S. governments at ALL levels (federal, state, and local) need to start DOING what the Constitution says rather than ignoring it and doing what they "think" it says (or worse, just plain flaunting their abuse of the citizen's rights while knowing full well they're doing wrong).