Hell should have broken loose in 1973, but it didn't. When the courts figured they could get away with murder of babies they knew there was no limits.
Frankly I do not think they would have taken the risk if they did not know the Nixon administration, yes NIXON was not going to do more than make a public but token objection (just for show) and the Congress would not impeach. Sorry folks but I just don't see them doing it without some assurances there.
The court had the luxury of knowing that Nixon wasn't going to be doing ANYTHING in 1973 that would anger the court or Congress.