Nobody votes them up. I think the current thread has four upvotes and two downvotes. I understand the reluctance to shower someone with karma for the maintenance work of posting a recurring thread, but if the thread doesn't get voted up then it never gets to the default Main view ("promoted"), and you need to use the search box or the "new" view to see it.
Or the sidebar.
There are various people who feel that Lesswrong degraded in the last year. In the same timeframe more and more discussions moved into the open thread model and open threads became weekly instead of monthly.
I suggest to counteract that trend by opening all discussions per default on Discussion instead of opening them in weekly open threads. Having the topics in discussion makes it easy to browse the list of topics and choose the headline that are of interest, even if the thread got opened two weeks ago.