> Consumers catch on to dishonest business practices and want choose new market options if/when they becomes available,
That almost never happens
> Internet providers in the US are a perfect example of this in action: why would these virtual monopolies want to provide a better product if it's so hard for competition to materialize?
Infrastructure costs is why you don’t see hundreds of competitors. New companies either need the capital to build new infrastructure, in which case they are usually more expensive due to economies of scale, or they have to resell someone else’s infrastructure. In which case they can only be as good as the monopolies.
The ironic thing is in the UK there aren’t any monopolies in ISP. There is lots of healthy competition. So your example regarding deregulation proves the opposite of your point.