Haha, your argument is of a rare breed: it's self-negating. If the people belonging to your "certain class" automatically grow to enjoy what's familiar to them,

Haha, your argument is of a rare breed: it's self-negating. If the people belonging to your "certain class" automatically grow to enjoy what's familiar to them, then their first reaction to a new UI is the most unbiased information you're gonna get!