To be honest, I have a hard time seeing this work in the US so easily. Maybe Canada, but most US mainline carriers have a scope clause in their pilot contracts limiting the capacity of regional carriers' flights, with others having to be operated by the mainline. That leaves the mainline itself, which is so tied up in the Airbus/Boeing family that they're frankly probably too afraid to do anything different, especially by a regional carrier manufacturer. Plus, I'm really not sure what kind of amenities can really be added to those things (entertainment, for example).

I could be wrong, but that's my first impression.