While you are correct that diveristy by casinos to seek out non gaming revenue might be the answer to save them, I think that the nature of the economy at present makes if much more difficult to rent retail space.

Unfortunate as it is, as I travel down main street of my home town, I'm seeing vacant stores starting to pop up.
These people, the small businesses are the ones that really need help and need it now
As has been touched on before, this is probably the precursor to a need for a bailout for commercial property owners.

More money into the bottomles pit