It's not their place to say what's a better option, but to interpret what the Constitution says.
It's very possible they will say that the Constitution protects the right to bear arms, and that there is no reasonable assumption that the right only exists in your home. Most threats would be encountered outside the home. They may also say that the states may decide on open, concealed or both as a lawful method to carry, but they must allow at least one.
The question is not whether concealed carry is protected. It's about whether bearing arms is protected outside the home.
Hypothetically, SCOTUS could
agree with the Ninth rulings in Peruta
(no right to concealed carry) AND Young
(no right to open carry of concealable firearms) and rule that the only "keep and bear" right protected by the constitution outside the home is the open carry of long guns.
From what we've seen from the court recently in a variety of cases, I think the chance of that happening, even if they believed it to be the most true to the Constitution, is virtually zero (due to political correctness being their apparent mandate).
Otherwise, we'd see this (even this photo
is banned on Instagram as "inciting violence"! You can't make this shit up!):