Amen brotherI agree that one day day cricket makes sense in lower grades logistically, however I'm a firm believer that the Shield grades should play as much two day cricket as possible. The main reasoning behind that being that the bowlers tend to become irrelevant in the one dayers, as they're limited to just eight overs each. The matches then become "bat-offs" with the batsman seeing the dangerous bowlers' off, knowing that they'll be able to cash in on the fourth and fifth bowlers' later in the piece.
In two day cricket you have your best bowlers operating on unlimited overs, which in turn leads to a far better contest between bat and ball. It's just a far better product overall.