Honestly, there is just no need for a remake. Sure, fans will be able to replay the fun game, but there is almost no need for it. FR/LG and HG/SS were made, due to the fact, that the pokemon were unobtainable (because of the systems). However, pokemon from S/R/E do not fit this topic, pokemon from this game can be tranferred by pal park. Also, many new pokemon games now even have routes to find these pokemon from the Hoenn region.
The only thing left is the story, or... they can continue it off in Hoenn, were Team Flare try to make a comeback. But, that could answer that train station in the kalos region. For example; fans can buy a sort of value pack with the game, to go to Hoenn (via nintendo Eshop). It just seems likely, but... unlikely. My point is, there is just simply no point/ need for a remake, I myself am a fan, but still.