Well, given the diversity of Slashdot audience and their nonexistent ability to organize, a boycott is unlikely to effect any real change.
On the other hand, Alice Hill - President at Slashdot Media or some of her bosses from Dice Holdings, like Michael P. Durney - President and CEO or Klavs Miller - Senior Vice President, Technology can be quite effective in stopping this madness and idiotic destruction of value, if they care to understand the problem at hand.
I don't think all of this would happen if they realized that Slashdot's value doesn't stem from it as a news site (of which there are thousands), but as a news discussion site.
Messing with the comment, moderation and social functionalities and their design over here is playing with fire.
I don't think these folks understand that people don't come to Slashdot to read carefully selected news (which are not, BTW) in a pretty-glossy presentation, but to participate in or consume/read the discussion. And the new Beta demolishes that.
If someone else better skilled in writing would make a petition on http://www.petitiononline.com/ and direct it at those guys, that would be so much more effective than ranting here in comments, which these people probably had never looked at, or trying to organize boycotts among a disorganized crowd.