Upon disestablishment of an area, any proceeds of the special assessments, or assets acquired with such proceeds, or liabilities incurred as a result of the formation of such area, shall be subject to disposition as the legislative authority shall determine: PROVIDED, HOWEVER, Any liabilities, either current or future, incurred as a result of action taken to accomplish the purposes of RCW 35.87A.010 shall not be an obligation of the general fund or any special fund of the city or town, but such liabilities shall be provided for entirely from available revenue generated from the projects or facilities authorized by RCW 35.87A.010 or from special assessments on the property specially benefited within the area.