Well I guess I will give my explanation that I gave in the thread I made but more in detail. What I mentioned was that because B2/W2 are being released in June, & Ash has 6 badges by March 1st, is that a Filler Saga might now happen. We won't get another main game most likely until 2013, & I am guessing it will be at least a full year at the least, so by Summer 2013, which gives roughly 18 months of Best Wishes left, assuming the next main game isn't Gen VI related. I seriously doubt we would get long gaps from here on out but I believe the league will happen in December 2012-January 2013, which gives it 8 more months left, if its a September 2013 release for the imaginary Gen IV Games. The Orange Islands Saga was roughly 8 months, so its quite possible.
So they might either have a Filler Saga or they will have pretty lengthy gaps between Mistralton-Iccirus, Iccirus-Opelucid, and/or Opelucid-Unova League. Who knows if the actual storyline of the games might influence the anime as well.