Interesting thoughts.
Personally, in T6 content, I find Chain Heal to be insanely useful.
There isn't a fight where it doesn't get SOME use.
As for WoTLK healing... I'd have to see a few things:
1. How does Spirit Link work?
2. How much raid damage is taken?
3. Is healing stream/mana tide raid wide?
Honestly, if the answer to 3 is yes, there will ALWAYS be a spot for
one resto shaman in a raid. 500hp5 (approx) and a refresh of 25% mana
RAID WIDE would be insane (totem range issues non-withstanding... even
if this only went to casters... it would be a huge incentive)
I don't really care about PvP, I like Resto best for BGs, though.
I think Earthshield is a fairly unique and useful PvE mechanic. I do
agree that Shaman could use a new healing spell or two... something
with a HoT component, or an instant small heal... but I'm not sure it
will happen.
As far as I'm concerned, there should be a spot for 1 of each spec of
shaman on a raid... and I think all three bring something unique.
Shaman are fairly versatile, and I think they have a place in BC, and
I'm not worried about losing a raid spot in WoTLK. I guess we will
see, though.