You nailed it exactly. I've never been much of a commenter, but reading the comments from people who are generally well educated (unlike the majority of sites these days) is what has always appealed to me and kept me visiting since the 90's. Most of the articles posted here have been old news to me, but the presentation, and density of information, have been an oasis in the increasing noise.
The beta site seems to be catering hard to the kind of people that have driven me away from other sites and back to this one. It looks like a half-assed version of one of the more recent Engadget designs. I bailed on sites like that when they ditched utility and information density in favor of... I have no idea. These redesigns offer nothing of value for showing information in a coherent manner. There does not seem to be ANYTHING about the beta that is conducive to maintaining the utility of the existing site. People come to this site because of ho it is DIFFERENT from other sites. Making this site more like those other sites completely annihilates this site's value.
I get that they don't want to throw away a lot of hard work that must have been put into the beta, but I have to ask: Why? What are their goals that spawned the redesign? Do they just want to make something new, or is there an actual problem that they are trying to address? Are there frustrations with the infrastructure that they are trying to address (potentially valid, but they seem to be going about it the wrong way)? Do they simply want to expand readership? If that's the case, make a SEPARATE site. I do not think that ANY of the readers here will play well with people who find anything about the beta appealing. This site works for a specific demographic. If they want to make a new site, then make a DIFFERENT site, and leave Slashdot as it is.