My opinion: no effect. Since they're doing these on a "floating" set instead of tying a BG's instances to one set of blades, whatever extra comes in will just spill over into those underutilized blades that the low-pop BGs have been using for a while now.
Now, the real question is, even with the blade reconfigs, will the influx of people with Cataclysm cause even those to get overloaded?
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