Of course we should keep it. It's a place to track bugs, and keep everything related to a non working application in the same place. And if we didn't have it, people would just flood the devel list with bug reports, or not report at all, and non of them seem a great idea. I've got a couple bugs fixed with bugzilla, and if wine will ever be finished then eventually all the bugs will be fixed. And not really we get messages on the patches list with patches that fix something in bugzilla. And it's a good place to send developers that aren't sure what to do next.
Ivan.