Regardless of what fancy theories or correlations we can piece together, what speaks more too me for them making a game is money. Sure they make games for fun and the love of pokemon, but would prolonging a game that is usually in 2 gens after make monetary sense? I don't think it would receive any more money waiting then it would if they had it out next year or whenever it occurs within Gen V.
If they don't have RS remakes then it seems like this would be one of the shortest gens so they would go to gen VI sooner perhaps after they have a few spinoffs after BW2. Which if they have the usual four years we are due a new gen around 2014 so no new main series games until then if they don't go to Gen VI earlier would seem more of something to complain about then complaining about there being a remake.