For the inevitable relaunch/revamp, some creative team thoughts....
I'd like to see a writer with a strong emotional core, above all. Scale is much less important for a JSA book than it is for a Justice League or Legion book; like Teen Titans, its much more defined by the emotional relationships and underpinnings of the title.
To that end, I'd like to see Jeff Lemire move off of JLU - for which he is ill suited - and onto a JSA/Earth 2 book (I'd like to see JLU taken over by someone like Jason Aaron, big bouncy superheroics).
Barring that, I tend to think that Al Ewing is doing a great job on a JSA-style book right now in Mighty Avengers (or at least was in the last volume; haven't really followed it lately).
For artists, my choice for primary is Rags Morales. His style is emotive and classic and clear. Knowing his speed means knowing that you need another secondary artist full time, and Geoff Shaw has a wonderfully illustrative yet modern style.