Did you actually even read the post?! I'll try to put it in simple terms for you (since you didn't understand the first time).
If they put out the movie at the end of November, and it duds or children don't like it, then sales die for Christmas (and it's a likelyhood that parents return the merch before Christmas). By putting it out the week of Christmas, they get all of the "hype" buying (that you're referring to) and it's too close to Christmas for the negative backlash to have an effect.
If they truly thought this thing would have merchandising "legs", they'd more than likely put it out a few weeks earlier to maximize a Christmas buying frenzy. The late release date sends up red flags that they're expecting a major drop off in sales after the movie is actually released.
This is very much like what happened with Episode 1 when merch was in high demand until the movie came out and then dropped off drastically after people actually saw the flaming dung heap. The late release date shows that Disney might not have much faith in what they've seen so far.
