Steve Coll, the former Washington Post writer and manager, writes on the non-profit endowed newspaper for The New Yorker.
His argument isn't terribly different than those put forward in the New York Times: an endowment would provide insulation from financial pressures, and the revenue from advertising and circulation would suffice in paying down the remainder of a newspaper's costs.
That two major news organizations have examined ---- or at least placed the notion into the discourse ---- suggests much about the momentum of the idea. As Coll points out, it's strange that a tiny college might have a billion-dollar-plus endowment but something like the Washington Post have nothing.