Its a way to pacify fans, there's absolutely no reason for him to sell now or in a years time as things stand.
I always thought that they came up with that year just to get the fans off his back as 2016 was not too far away in the future so fans might just be prepared shut up and put up for a couple of years if they thought he was on his way.
One thing is for sure, if we go down hell never well us until we are back in the prem as he would lose alot from his initial investment.
I don't believe that. If he believe that the present value of selling is significantly higher than not, even though it is nowhere close to the initial investment, he will sell up. He is a business man, after all.