Public-utility "last mile", far from being opposed to competition, would facilitate it. The local or state government would own the ROW and maintain the fiber - maybe thru a contractor whose role is restricted to that function. Then your household or business line goes to a box where different companies can compete for slots/ports/whatever, and then you would choose which provider to connect you from there to the big pipes.

The "to the premises" provider would make a regulated profit, just like utility-model water and power companies, and the upstream providers would pay the going rate for their connections to customers, and compete for customers with rates, policies and over-the-top services.