the baggage issue is not an issue if these aircraft are scheduled for proper routes.
If you remember correctly, Embraer actaully brought an aircraft here a few years ago (about the same time RJ ordered them) and one of the issues (there were more than one) was the baggage/freight capacity using GF's passenger demographics etc.
However, I do agree that sending them to isolated destinations without the required support would be a big problem.
Finally, what is wrong with the 319s and 320s? Yes, certain flights are down right now, but GF certainly is not the only airline feeling the pinch at the moment.