Now...I'm just a sheep, mind you, so perhaps my grasp of this is sheepish at best, but...
"Voting with your wallet" only works the intended victim understands why you're not buying his products anymore.
Some Guy on the Internet (SGOTI) saying "I ain't gonna buy no Smith & Wesson no more!" accomplishes exactly nothing.
Organizing a letter writing campaign is a lot less work than trying to organize yet another internet boycott. Have you contacted Smith & Wesson and told them the lock will prevent you from buying their guns? Writing, emailing, and calling requires less organization than an effective boycott, also.
But it's much easier to say "I'm just voting with my wallet", not actually do anything, and then keep griping when nothing changes.
Write Smith & Wesson a letter. Instead of repeatedly telling me and the handfull of people who frequent the Revolver forum, tell Smith and Wesson you won't buy a gun with a lock on it, and tell them why. Get everyone you know that's just as irritated about it as you to do the same thing. Tell S&W that if they do runs of guns with no locks, then you'd be interested in them again. I'm sure a bunch of people on S&W Forum would jump on this.
If the people who are just SO ANGRY about "THE LOCK" aren't willing to make the slightest effort to tell Smith & Wesson what the problem is, then they can't turn around and complain that Smith & Wesson doesn't do what they want.
Maybe it'll work, maybe it won't. But any of the above suggestions have a hell of a lot better chance of changing Smith & Wesson's position than bombarding every revolver forum thread with bunch of "I won't buy a gun with THE LOCK" and "+1!" posts.