As for the Shaman being a double caster...so is every other gestalt you've made that started as two spellcasting classes, (edit) with the Arcanist actually gaining abilities from a simple Sorcerer/Wizard combination

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No switching for me, I'll play what I chose as I like the flavour of the class...what follows are just some constructive comments about why I think it's a little weak.
Merging a Cleric/Druid, they gain nothing apart from the special abilities and spells (as they have exactly the same BAB, Saves, HP, and of course it got stuck with Druid armour/weapons which subtracts from the Cleric) so that's somewhat of a downside too when they lost a lot of druid powers with no replacements.
Most of the domain powers are fairly weak 1/day things so that's not a great selling point, and the spells the spirits can grant are restricted by their power level so that's not terribly good either, especially when you only get to select one full domain at 1st level having protection forced on you.