I feel that you could look at it from two perspectives.
1) Money: If fans want it that badly (and as far as I'm concerned, Johto was my favorite region) Nintendo is bound to create it because that will make them...money.
2)Need: Red and Blue were remade because it was impossible to "catch 'em all" with just Ruby, Sapphire, and Emerald. When they created Firered and Leafgreen, they added Johto Pokemon. The same goes for Colosseum and XD. They were made to give trainers the rest of the Johto Pokemon. Therefore there is no need to create a remake of Gold/Silver.
I would love it if Nintendo remade Gold and Silver. And from which perspective do you think Nintendo will take? Money or Need?
P.S. The Answer is money.