I think we are living in a time when companies are being frequently trusted. Because when they claim that mergers reduce costs, the automatic thought is the cost will trickle to the consumer.
The other outcome we are eager to see is the innovation that occurs at the extra large scale level. Do we see the more robots make it in to industry? Or intensive AI? The opportunities and imaginations have exploded after Facebook and Google utilized their dominance for the greater good.
Lastly, enforcement against unethical illegal behavior has become easier. Reducing the need of cynical and paranoid reasons to prohibit mergers. Only when there is actual concern of legal unethical actions negatively causing market consolidation and preventing startup incubation, the FTC will not be doing any of the things the paranoid want it to do.