Could easily argue that you should replace resto shammy with other healers instead for their buffs while having ele. Besides you're disregarding the crit chance buff.
Crit chance can be replaced by;
Heart of the Crusader - many Paladin
Master Poisoner - *** Rogue
SP replaced by ;
Demonic Pact.
So, wrath/FT totem is not only replaceable but inferior compared to a locks SP buff, assuming you have..almost any paladin in the raid.
Edit; Lol can't say *** rogue :D
Edit2: IF you were referring to ele oath crit (instead of wrath crit), then that can be replaced by a boomkin aura.