The only reason why that happened was because it was put up so late and two unofficial SotY threads were created prior to the official SotY thread (and thus people got kind of sick of being told to come back and vote). The SotY thread should remain separate since there are two people who know the musical genre pretty well managing that thread.
What you say implies that SoTY 2010 faired better, but it didn't. In fact, if it weren't for the final few bumps from GhaleonQ and Nert, the voting thread for SoTY 2010 wouldn't have broken four pages.
I'm not speaking ill of the effort put into the SoTY threads - clearly it's commendable, however community interest at this juncture is severely lacking.