If I'm not mistaken... Ralph and Sue lived longer in JL 3000!

It all depends on this picture from Justice League 3000 #14. That's a flasback with (left to right) Ralph, Max, Oberon, Ice and Sue, showing a moment, way after the Super Buddies issues, sometime after Fire exchanged places with Ice at hell.
The story also states that Ice never saw Fire again, however,
a. that's not how Ice revived in the pre-Flashpoint continuity, as seen in Birds of Prey #105 (July 2007),
b. Fire and Ice reunited and teamed up in Justice League: Generation Lost (2010),
c. by the time Ice was resurrected in the pre-Flashpoint continuity (July 2007), both Ralph and Sue were dead and Max had turned evil.

If I'm correct and those are Ralph, Max and Sue, it means we have our first post-Flashpoint continuity in which they are still alive at the present time!!

And here is a cool picture of the whole gang. Just because:

Update: I've confirmed it at J.M. DeMatteis blog, CREATION POINT (actually, he did said so in an interview that I missed before I asked). By the way, that blog is really awesome, J.M. is incredibly cool and gives honest answers to about everything.