Govt. is one the fostering corporatism by creating favoritism in sectors of the economy that gives certain players upperhands over others. So, if the corps have to stand on their own merit without governemnt involvement, they have to beat competition by providing a superior product or service without thrid party intervention.
I think large corporations have tools at their disposal that you might not have considered. Large corporations can undercut the competition for as long as it takes to drive the competition out of business even if it means selling at a loss. Japanese corporations were doing it to us in the 80's.