Exactly, and that means that airlines like Southwest wouldn't even consider it. One of the ways that low-cost regional airlines save money is by standardizing

Exactly, and that means that airlines like Southwest wouldn't even consider it. One of the ways that low-cost regional airlines save money is by standardizing on a single aircraft. For Southwest, that's the 737. Every single pilot, inspector and mechanic in their entire organization only needs to be certified on a single airplane, they only need to have one parts supplier, only one set of tools, etc. - it's enormous cost savings.