OWD,
If corn prices crashed the shelter belts bulldozed over would still be gone, but the sloughs would return in time. That they would is why the farmers are lying miles of perforated field pipe to keep them drained. The maintence of them is worthwhile only as long as that land they drain is yeilding a profit.
In absence of a farm bill that provides for set aside lands, SD's pheasant hunting future will fall squarely on the backs of the state government of SD,
I hear rumblings that this will be an agenda item at the next session of legislation.
By the way, are you still hunting the Froid area with your little Springers?