It's not fear of change. This isn't really a better system, it is, as you point out, the same useless system rehashed. It's almost as meaningless as the old system was. The bottom line is that the probation thread has value because it tells you who to avoid, which has distinct value. But if new people come on, it's easy to tell through observation and interest who is a reliable buyer and seller. I know of people here who are lurkers with zero posts and no thread? So what?
I rarely participated in the old kudos thread, and I won't be starting my own thread here and linking it. The probation list is a fantastic idea. The kudos thread is, in my mind, useless.
Sometimes change isn't a good thing because it isn't really a good idea. This is just a bunch of people having a thread and people saying I had a good transaction. And? If you had a bad transaction, how many incidents are we going to see of that that just wasn't discussed or raised in the probation thread already?
I'm not opposed to change, I'm opposed to useless change. This is it.
The circumstances in which I think it'll be useful are for example when there were books offered by someone who'd been on the boards for a little while but I'd never seen them sell before or even noticed their general posting. I pass on sellers like that until they gain some kind of reputation as an honest trader. If they have a feedback thread showing that they've successfully completed transactions, then I'm far more likely to give them a try.
In my own case, I've sold to a lot of board members but they've nearly all been by PM so they don't get seen by most boardies. All I can do is to provide references to prove that I'm on the level. Having a feedback forum is in my opinion a lot better than just having to provide references.