The Supreme Court has not weighed in on that yet. Heller only held that there is a right to carry inside the home, and did not address the right to carry outside the home.
The Seventh Circuit (which includes Illinois) and the D.C. Circuit have held that the 2nd Amendment protects at least some right to carry in public, while the 9th Circuit has held that the 2nd Amendment does not protect “in any degree” the right to carry in public.
The Supreme Court denied cert in the 9th Circuit case, so, as it stands, California, Hawaii, and the other states in the 9th Circuit could become “no issue” states tomorrow if their legislatures chose.
And they might do just that, although that’s probably tempting fate. On the other hand the 9 political hacks in black muumuus might not take another 2A case for 60 years.
Politics is a scam and we’re suckers for playing.
California can beat this by simply ceasing permit issuance (new and renewals). Then reciprocity goes away. They’ve already pretty much banned open carry.