Law-abiding concealed carry folks will obey the sign, or they will turn around and leave the store.
Armed felons will ignore the sign, do whatever they want.
Same as it ever was.
My state has made it lawful for me to carry concealed, with exceptions.
A business with a sign is not an exception under the law.
Period.
If management chooses to engage patrons and challenge every bulge, it will end badly for them (go woke, go broke).
If asked to leave, the law stipulates that refusing is trespassing and THAT is the only exception which will apply beyond the CHL statute.
After that, it's game-on (civil proceedings against them).
FRiendly advice: GO right (don't lean).
Most places signs are not legally binding, so you are not breaking the law if you ignore them. The most they can do is ask you to leave.