The sheriff of any county adopting the provisions of this act shall be and is hereby relieved of all power, authority and responsibility now or hereafter prescribed by law from and after the date fixed for the transfer of such authority and responsibility to the law enforcement agency. On the second Monday in January next following the primary election at which the provisions of this act are adopted, the office of sheriff in such county shall be and is hereby abolished, and at the general election following such primary election, and at all general elections thereafter, no sheriff shall be elected in any such county.