In an ideal XM radio world, one 'set-aside' channel would be 50s-70s pop MOR vocals, one would be traditional TexMex music (like XM92 was), one would be like the old XM "Fine Tuning". I know that Quincy Jones was interested in having a channel, and I could imagine that being of high quality IF he was one of those selected.
I would be bummed if it does turn out to be 'god-casters' (note: Capital G excluded), colon-blow companies, and overmodulated foreign language talk shows.
Either way, it violates the original agreement, which was there was already to have been bandwidth setaside, AND these channels were to be free to all radio owners, include unsubscribed radios, or any unactivated radios (which XM could easily do, as they can with their free previews). Only old Sirius junk would be a problem. Likewise, all Sirius A la Carte radios could carry this junk programming for free, along with all XM rigs.