Perhaps you aren’t aware of how easy it is to ignore the ACA. In fact, it’s almost TOO easy to ignore it. That’s why it’s so hard for most people to mount a solid legal challenge to it. A plaintiff has no standing to make a legal challenge unless it can be demonstrated that he or she has suffered harm or is likely to suffer harm as a result of it. It’s so easy to ignore it that it’s almost impossible to make the case that there’s any harm at all.
If there's more to be done to undo it, then those steps should be taken. Trump should nullify/reject ACA as unconstitutional but not try to change or make new laws as an alternative.
AND private companies, the states and the President do NOT need court approval to nullify and reject any unconstitutional federal act including ACA - the Constitution, not SCOTUS, is the Supreme Law of the Land (art. VI, cl. 2).