For me the appeal of all-shaman group was exactly what Suvega mentioned... mail armor, heals, self rez, multiple heroisms, burst damage (my previous experience being affliction lock). I did have ToW for part of my levelling but respecced NS at 70 when I started hitting the BG's for S2 gear and while I've missed it and somewhat ok geared now it hasn't been good enough to pull me back to respec, and that would only be my second ever respec on the shaman, lol 5g each, so the cost is not the issue. I use my death ray (EM + NS) when I instance all the time to take down multiple casters in MgT regular.

I think all of this concern about Wrath when it's not even out yet is just pre-expansion jitters, lol. I remember all kinds of crazy worrying before TBC came out too. Seems like Blizzard is making wow even more fun (and somewhat "easier") in Wrath that I don't think we have to worry about it so until after we all get to 80 and see how it plays.