Why the intense critical scrutiny of the DSA loadings? How do other airports' winter loadings compare?
Even if some DSA routes are struggling isn't this to be expected for a new airport? It'll take some trial and error to find which routes work and which don't.
I've flown 4 times from DSA, including once this winter, and with the single exception of the now discontinued TOM route to DUB the flights have all been very nearly full, and one from Malaga was completely full.
I detect some anti DSA propaganda from some parts.