The legislative body’s decision on the protests shall be final and conclusive. However, if the owners of taxable real property in the district having an assessed valuation of more than one-half of the assessed valuation of all taxable real property in the district at the conclusion of the hearing have on file and not withdrawn their written protests objecting to the formation of the district, the legislative body shall find that a majority protest has been filed, and the proceeding shall be terminated. No further proceedings shall be had or taken pursuant to the petition.