The same arguments were used to justify the North American Trade Agreement, which was another terrible idea. NAFTA made it much easier both to move jobs out of the US to Mexico. Additionally it helped destroy small scale farming in northern Mexico, because these farms couldn't compete with subsidized US agribusiness. Now most of the food imported from Mexico is from large scale farming, because that is competitive. The end of small farms enabled the growth of marijuana farming and the growth of violent drug cartels.
Besides the steaming pile of bull crap that is the DCMA, one of the other Republican moves was the repeal of the Glass-Steagall act, which directly lead to the Crash of 2008. Glass-Steagall didn't disappear all at once; the dismantling started during the Reagan years. It held up as long as the Democrats were in control and Volker was in charge if the FED. When Greenspan got in then the end of Glass-Steagall became a priority for the Republicans and Wall Street, and they got what they paid for.
If you don't like the DCMA, you should be terrified by the TPP, a secret trade treaty. We, i.e. the public, had no clue about what is in this thing. It's been given so called "fast track" status, so there will very limited debate or opportunity to amend the language. And since it's an international treaty, it supersedes US law. If it passes in Congress, Obama will sign it. How do you feel about letting Asian nations decide our trade policies?
The TPP effectively allows big business interests to offshore the regulatory process. It's so much easier to change the rules of the game in smaller countries where things like environmental and consumer protection have minimal impact. Since we have no idea with the treaty actually says, it seems likely that a lot of the protections that we have in the US will be effectively gutted with no way override it.
If you think things are bad now, just wait.