I think that a _proper_ definition of "deregulation" is "completely removing regulation." Anything short of that is "partial deregulaiton."
I think that many people act as if and/or think that a proper definition of "deregulation" is "reducing regulation."
However, I see no point in arguing about definitions. I propose that we just use the terms "complete deregulation" and "partial deregulation" from here on out, so as to be non-ambiguous.
Given this, let me state my stance on partial deregulation. I thought about stating it earlier, but it seemed just barely too tangential.
I think partial deregulation is often much worse than regulation.
For example, regulation may take the form of "Cable company X has the exclusive right to lay coaxial cable in our city. In return, cable company X must allow our city to have our own special channel where we can post public announcements; and, it must lay wire to all areas of the city, regardless of income level; and, it must allow the city to set rates that subscribers can be charged."
Under partial deregulation, X may be allowed to set whatever rates it wants, but still have the exclusive right to lay coaxial cable. So, it can gouge customers.
In this case, partial deregulation didn't correct a situation in which the government was overstepping its bounds. It partially corrected it, and in doing so, made things worse.
I think this is overwhelmingly the kind of thing that happens with partial deregulation, and I think partial deregulation is overwhelmingly what happens these days when politicians talk about deregulation.
Sorry, I know you just wanted me to agree/disagree with your definition rather than adding a bunch of new intellectual content... but I figured the above would be helpful (and likely similar to what you were thinking).