We have been for a while now. In usual political fashion, there are two competing solutions (regulation vs trust busting) locked in a perpetual stalemate to the advantage of the abusers. Looks like you're in the regulation camp.
"Trust busting" is often offered as an alternative solution, by which I mean breaking up a company into smaller, more vulnerable pieces and letting a competitive market handle the rest.
Both methods have pros and cons and there are more than a few comments in this thread already arguing about which is better.