I've heard this before. I suspect if those who tout it were to get a chance to appear before those 9 justices, they'd quickly find they were in over their preverbial heads, particularly when it came to distinguishing what contitutes "legislation from the bench" and "adjudicating law". Generally speaking from what I've seen, those who like the rulings of SCOTUS call it one thing, and those who don't like their rulings call it another. Both labels are convenient if nothing else.
Regardless of what it's called, it likely won't be favorable. Imagine the turmoil that a positive ruling (an individual right) will cause with the 20,000+ gun laws in force... including the clause in our own state constitution I mentioned earlier. Nope, I don't see SCOTUS upholding the 2A as an individual right.