No issue is unconstitutional. Illinois went concealed carry because the other choice presented them by the courts was Constitutional Carry. The last refuge of the anti carry scoundrels is in may issue states like MD and NJ.
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.
Dont forget CA and MA.