Inverting NPC Class Occurance

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After reading up on bards a bit, I had an odd idea for a specific campaign after pondering the idea of making low-leveled encounters bards, where the rarity of classes was inverted, so to speak.

PC characters are generated as normal, but commoners would be very rare and only important NPCs would have that class, bandits are replaced by renegade wizards who might have a fighter or thief in their ranks if they count themselves lucky, and bards replace the warrior/thief class as the basic template of your standard kobold or goblin, with dozens of the beady fucks assaulting low-leveled adventurers with Vicious Insult. Clerics and Paladins would still be clerics and paladins, but hostile clerics/paladins would be significantly more common while their friendlier counterparts would generally be harder to find, though normally antagonistic classes like rogues and warlocks would likewise have more "friendly" individuals show up on a regular basis.

Does this sound completely retarded? How would you justify this in-setting?