And your comparison of the changes to druid and DK are still apples to oranges. They were melee specs that were changed from one type of melee to another, dps to tank. That still does not compare to the change of a ranged being turned into melee. There have been instances of ranged spells given to melee, and vice versa, but never has a spec had it's entire foundation changed in the way SV has.
And I agree the best option would have been a 4th spec, but that is not the way Blizzard chose to go, nor do I believe will it be a choice they will make in future.