The CTRA is actually busier since Patch Y than it had been for a month or two beforehand. There are a few reasons for this, I think.
Changing Race2 to LRF and TBO and moving GT2 and GTR to Race 3 has been a great success. I think timesharing the TBO and GTx server was a great theory, but just didn't work. However, a dedicated GTx server can, and does, stay busy all day. Race 2, when it takes off, can also do very well.
The problem is that while we've significantly increased server population since Patch Y, we've also increased server availability. We went from 2 busy servers to 6 busy servers, but we've fallen again now to 4. Those are Race 1, Race 3, SS1 and BnJ.
I think the UF-BR server will be back again. Bump and Jump died off before Patch Y, but since its relaunch it's been busy for several hours every day. We moved the UF-BR from entry to Bronze, and while it had the desired effect of cleaning up the racing on that server, it also ultimately killed it. This is the difficulty in finding the balance. Once we get close to the UF Baby R Season 2, I thoroughly expect a resurgence of enthusiasm for the server.