At this point in time, the only reason to worry about this is that if it could be proven he was NOT qualified to be President under the Constitutional requirements, U.S. Marshals could walk into the Supreme Court and walk out his appointees. If he was illegal, then their appointments would be null and void and they would be removed. And maybe all cases where they were in the majority would have to be reviewed. It is all a pipe dream though. Nothing will ever happen.
If it can be shown that he was fraud, it should be shown for the sake of history and the future. IMO.