This has been a problem under every administration over the past 50+ years. The Sherman Act appears to have no bearing anymore. Seems like with each one of these mergers, a small bone is thrown to the consumers, but for the most part, the consumer continues to get screwed while big business and their shareholders benefit.
Market distillation has been going on forever. From the early 1900s until the 1930s there were over 1500 auto manufacturers in the us. Today you can count them on one hand (excluding specialty companies like Ariel.)
The corporate tax break is going to make this much much worse. My company is going to go nuts with more acquisition, which is what I see most publicly traded companies will be doing.
Walt Disney always said something to that effect to his employees as a reminder it was all supposed to be about fun. "I only hope that we don't lose sight of one thing - that it was all started by a mouse."