The existence of a power imbalance indicates you can't really do without the other party. The big companies have amazing economies of scale, and consumers (on their good side) can benefit greatly from them. There's a handful of airlines, two mobile networks, one ISP for most people, etc.

edit: Also, in my experience running businesses, the 10% of the customers cause 90% of the problems, so eliminating them results in much greater profits and cost savings. And if the problem customer is not high value, then there isn't much incentive in dealing with them.