The more obvious solution is taking aggressive trust-busting action and preventing further mergers rather than passing laws to leash the remaining few actors in an already-broken, over-consolidated market.

I'm sure this will draw immediate reactions that in a heavily lobbied (i.e., bribed) environment, it's a pipe dream to hope for antitrust action to occur, but I would point out that the very same environment isn't any more likely to impose meaningful regulation, either.