I actually played the Suspect UU Ladder yesterday, and I got to say it was fun no doubt; old UU is blown into the winds with few if any of them seeing any game time.
For those hardcore UU players, I assume you are overwhlemed, and most likely disappointed the only good thing that came out of this is proving that BL pokemon "Kick-Ass", though the old UU is suffering quite a bit.
Why do people refer to BL as a tier, because it's not it is just a ban list from UU, if anything this shows you we can not ever merge OU/Uber together for a test like this. Though a gradual introduction would have proven tedious and most likely in-effective this big power surge in UU has been intresting to watch.
These are just my observations,opinions.