Here's the real problem...Dice bought a niche website catering to a non-mainstream audience and is frustrated that ad revenue is not commensurate with a mainstream website, so now they want to maximize revenue by pushing the site to a wider audience. In other words, dumb it down, white space and images everywhere, probably sensational headlines...a copy of every other website out there.
Here's what Dice needs to realize about Slashdot... We are your content. You are otherwise nothing more than a link page. A cheap version of Google News, and on to delay at that. We come here to make and (more importantly) read comments from the audience we have NOW. A wider audience will just mean it will turn into the CNN comments section tragedy of the commons and your content (read, us) will wander off to greener pastures.
Just leave the option to use classic permanently, or make beta nearly indistinguishable from classic from a functional and feature standpoint, or best yet, do nothing. Accept that Slashdot is not going to be a cash cow for you. Maybe, if you listen to your customers and are very careful, you can pay the bills with it. But alienate your customers and that will be the end of Slashdot, slowly, but surely.
Just accept that the product you purchased is for a specialized audience and stop trying it widen that audience. Instead of trying to maximize ad revenue by bringing more users that will change the community, try to maximize your profits in less obnoxious methods. Sell Slashdot apparel more openly, maybe develop a line of printed matter useful to the maker scene, consider adding a dedicated reviews section in current formatting.
If you want an example of a site I think has managed to squeeze all the life out of their original classic page design while staying current would be Photo.net.