If public opinion continues to move in that direction then sure, regulation will get stricter. That's the way it should be. Europeans are largely happy with their higher level of gun control. Imagine if 100 years ago some Englishman proposed to make pistols easily obtainable for the rest of time- would that be fair to the current batch of Britons who wouldn't approve of that policy? And nobody is promising "if you agree to this restriction then we won't push gun control any farther." It's always "we think this restriction makes sense and we'll see where it goes from here."

By the way, this is the story of every regulated industry as it starts to fall under the specter of regulation. Everyone says "Who are you to tell me what I can do? Where will it end?" The answer is that laws will stop changing when public opinion stops changing.

I'm sure that those getting rich at the teat of Carnegie, Rockefeller, et al were none too pleased about increasing antitrust regulation in their era. It went against everything they had built their empires upon. That's too bad. It had to be done to address an urgent threat to American way of life. Gun control advocates see mass shootings in the news and see such a threat.