It does appear, with the "boycott" of Slashdot in full swing, that discussion quality on Slashdot is markably improved, not simply better than when it was when the betoddlers were throwing their rattles out of the high chair, but improved compared to how it is usually. This is, of course, my perception, and it's possible that I'm seeing what I want to see. Still, I'm seeing mostly on-topic material, and strangely I haven't commented as much as I did pre-boycott because I usually find someone else has said either what I wanted to say, or something that addressed my thoughts so entirely I don't need to say it.
Obviously beta isn't in place yet, and quite honestly, it needs work - the concept is great, but it needs lots of features implemented that aren't yet. So it's unlikely that people using beta are improving the place. On the other hand, it could be argued that people who liked D2 and stuck around after its implementation were the wrong type of contributor. People who remained despite D2 ensured some level of quality was maintained, but for the most part the decision by many to leave caused Slashdot a severe amount of damage.
What we have, with Slashdot sans betoddlers, is a mix of hangers on, new people who weren't attracted especially by D2, and people who never cared that strongly and still don't.
To that end, while I'm sure Dice is reconsidering whether it's worth going ahead with the redesign given the fit many have thrown, I think it would be worth their while accelerating the process and getting Beta "finished" and feature complete. I think Slashdot will benefit from a refresh, I think Beta is going in the right direction - even if the process of testing it was, maybe, perhaps, just stupid, and I think the people most upset about the changes are, with a few exceptions (because there always are) not the people who actually make Slashdot a good place to be.
One thing I would suggest is Dice open source the new Slashcode (if they haven't already, I haven't seen anything to suggest they have). It'd help us contribute improvements, show good faith, and be entirely in keeping with the history of this website which has always been free software.