I would be very surprised to see R/S/E remakes in this generation, although it could be a realistic possibility sometime in a later generation, perhaps in the next generation, when we need a way to get some of the older Pokemon. But yeah, I do agree, it would have to have some added features, for one, day/night would have to be used in it, and of course we would want some extra stuff to prevent it just being a remake. In all honesty, the new games have the "almost 3D" look to them, but IMO the graphics in D/P/P aren't hugely different from R/S/E, and right now, I just don't think that remaking them would have the same "wow" factor as seeing Johto on the DS would have.
But I think that it will happen someday... just not for a long time...
I will guess 2012 for 5th generation games and 2014 for R/S/E remakes. Let's see if I turn out to be right. For the record, I am guessing USA release dates.