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I don't think there are any solutions that don't include state mandates. However, one thing that is rarely talked about is structuring companies that are involved in news media differently than others. We are not a real free market economy, certain corporations already are under a certain amount of regulation, their interests and activities are circumscribed (as with the banking industry, until a short time ago). Those industries that are seen to be working in the common good, or at least bear a great amount of influence over the economy or governance, must abide by certain rules of conduct.
To some extent its something that already happens with the FCC, and lobbyists seem to undo most of that anyway. Perhaps a total economic and political collapse will get things moving in the right direction. (that's sarcasm)