I didn't feel like going through every single battlegroup from EU and US....so this list is incomplete. But here's a short list of shamans that either don't use glyph of capacitor or glyph of ghostwolf, or in some cases neither. It happens more often than people realize but heres a few.
If you're interested in seeing how ppl glyph and talent these are the links to arena ladders, I think many will be surprised how easy it is to find ppl who don't use "mandatory" glyphs. Or "mandatory" talents for that matter.
And just so people don't say I'm cherrypicking: take a closer look at the US ladder that I linked. That's Bloodlust which has long been considered the premiere battlegroup for serious pvp'ers. Now use the filter so it only show teams with shamans. There are 30 teams with a shaman, in this particular BG, @2200 or higher. 20/30 either don't use glyph of gw(5) or don't use glyph of capacitor (11) or don't use both(4).
The vast majority of shamans who don't pick one or both of these glyphs find purge to be much more useful. You'll be hard pressed to find an arena team that doesn't feature 1 of either a druid, mage, paladin, priest, or shaman which are all classes that its very important to purge.
So don't be surprised if purge gets nerfed.
The point is these abilities aren't what's holding the class back, whether you feel you have to glyph or talent them to make them functional.
If you're of the opinion that enhancement has mobility issues, the problem will remain whether the glyph of gw/capacitor is baseline or not. People were complaining about enhancement mobility long before that glyph was ever introduced.
If you're of the opinion that elemental has survivability and/or dps issues, the problem will persist whether the glyph of gw/capacitor is baseline or not.
Whatever issues the specs are having should be handled through the specs which is why I feel that these complaints about the glyphs and the abilities that they are associated with do nothing more then serve to distract us from the real problems at hand.