At the time and place appointed for the hearing of protests or at any time to which the hearing thereof may be continued, the city council shall hear and pass upon the protests, and its decision thereon shall be final and conclusive. If the protests are sustained, no further proceedings shall be had under the ordinance of intention but a new ordinance of intention to make the same or a different change or modification of grade may be passed at any time. If the protests are denied, the proceedings shall continue as if such protests had not been filed.