If there is a fibre to the building type network in place it will be pretty hard to justify paying the money to maintain ugly old hacks like DSL and cable inter

If there is a fibre to the building type network in place it will be pretty hard to justify paying the money to maintain ugly old hacks like DSL and cable internet. You might as well add 56k modems to the list of competitive services. Such things are simply not competitive to fibre. In terms of simple economic efficiency having multiple redundant last mile networks doesn't really make any sense. That's why no city has multiple competitive sewer and water systems. You don't need multiple last mile systems to have a competitive ISP/TV/phone market. You just need good policies to allow entities that want to sell data services to get access to the last mile infrastructure. You can even bill for the LM infrastructure separately if you want to prevent bundling.