This is already done. You can easily hearth, switch, and use ABS/binder to remember your buttons, and reforge profiles to save your reforges. If anything, it is this that you will be "forced" or "required" to do for the "good of the raid" in any such competent guild.Going more than that just means you pick the spec that's best for each situation (boss, etc). No drawbacks of picking a certain spec, so it forces you to play specs you may not like for the "good of the raid" or something.
The only consequence of adding tri-spec (and honestly, I am in favor of quad-spec for druids at this point of the game) is that you have less addon bloat and wasted time. It's funny how post 5.0, you don't even see class trainers on the mini-map!
Now, between "8" specs, this isn't as bad, because you have glyphs and talents able to be changed on the fly for a reason. So if you want to say, switch between PvP and PvE versions of a spec, that is what swapping glyphs and talents is for. You may still have to remap action bars/binds, but there is significantly less micromanagement just to be able to play the game.
This is especially more so due to the brilliant GC/blizzard idea that everybody who plays should be forced to do tons of daily quests to be competitive in PvE, whether they also PvP, also do heroic (and not just normal mode) raids, whether they also collect pets on the side, despite the tons of other "optional" time sinks they may actually find fun.