Fox guarding the Hen House - SCOTUS being considered in any way, shape, form or manner the body that should be deciding the limits (if any) on lower courts being able to issue nationwide injuctions.
Congress, and Congress alone (with Presidential final yeah/ney input) has the CONSTITUTIONAL AUTHORITY to set up 'lower courts' and what they can do. NOT THE SCOTUS.
Has everyone forgotten: COURTS ARE NOT DEMOCRACY.
The very idea that the OPINION of ANY JUDGE can be substituted for the 'We the people' is not only repugnant, but is also dangerous.
And yes, it behooves one to remember that even rulings from SCOTUS are simply a majority OPINION of only 9 unelected potentates. There really is no three-branch balance involved when it comes to SCOTUS - with their lifetime appointments and no accountability to either Congress, the Executive Branch or the states.
Removal through Impeachment of a SCOTUS judge has been and will continue to be a toothless tiger - it is not a 'check nor balance' on the power of SCOTUS, much less of the lower court lifetime potentates.