Greetings Kenton:
Insecticide treatments are not a feasible option, therefore you need to think about timber utilization or personal firewood use.
If this were my property, I would contact a local professional forester to evaluate the quantity and quality of merchantable ash. If it is determined that there is a significant volume of ash present, then I would probably have the forester conduct a timber sale to capitalize on your timber investment.
List of professional consulting foresters: http://dnr.state.il.us/conservation/forestry/