This is somewhat close how Germany handles it. When the monopoly of the state-run telephone service was destroyed, Telekom was allowed to keep the physical line

This is somewhat close how Germany handles it. When the monopoly of the state-run telephone service was destroyed, Telekom was allowed to keep the physical lines, but had to rent them out to any company that wants them, at a rate set by an official oversight organization. I think this was a great success.