And from the un-aviation-educated perspective, there's no difference. Walk on a CRJ-700 or -900 or big ERJ and what's the first thing you see? First Class. Who would have thought we'd have RJ's running around with First cabins on nearly three hour routes?
Let's just hope other companies do what jetBlue and US do and keep 190s at the mainline level. That's a start to bringing 170s/CR7s back to mainline. Will it happen? Doubtful. Nice thought though.