If there are currently fewer than 3 options for services in any areas they are proposing to merge or if their merger would drop the competition
Cable companies do not share their infrastructure, and they usually have exclusive "franchise" agreements with municipalities. Are there actually any areas where buying service from your choice of Time Warner, or Charter was an option?
I believe this in the past has been the big cable co's argument that mergers between companies servicing different areas don't reduce competition.
They already have the monopoly..... the only way to switch is to move house. Would anyone actually move house to switch cable carriers?