Have to say I was not expecting that as an answer! But looking into it a little it does seem like a pretty wise choice.
The aircraft easily has enough range for all of the planned destinations, and the F70's decent runway performance should mean flying ex. SOU will a full load isn't too much of a concern (if anyone has some even vague figures they would be interesting to see).
From what I can see, the only issue will be the presumably high CASM of the aircraft compared to the usual 319/20 and 738's used by the loco's. Presumably the average fare will have to be relatively high (or not lolo...) to balance this out, although only having to sell 80 seats may aid this somewhat.