Superman is going to be the first Meta in the relaunch, so the Golden Era heroes simply don't factor into this new continuity...which is weird, because everybody's history changes except for the batfamily.
Wally was never the first Kid Flash, and never existed. Bart is the Kid Flash in the Teen Titans. Cyborg is a founding member of the JLA
Mr. Terrific and Hawkman are the only known survivors of the JSA, with possibly Dr. Fate.
also, Geoff Johns proved that the JSA titles could sell: they were very popular.