There definitely will be remakes of Diamond and Pearl at some point in future, I'm positive, as they seem to create remakes of each game they release once every generation or two. When GameBoy Advance was still in its prime, we've had FireRed and LeafGreen, which were remakes of Red, Blue, and Green. In DS generation, they've given us HeartGold and SoulSilver. This time around, we're having Omega Ruby and Alpha Sapphire--remakes of Ruby, Sapphire, and Emerald (have been waiting a long time to see this happen, personally, and I'm glad they're finally doing such a thing).
DP will likely get their own remakes during Nintendo's next edition of handheld consoles. Diamond, Pearl, Platinum, and other Pokémon games of the like have very advanced graphics, mechanics, and other things of the like, so if they were to be remade, they'd likely have to gain some heavyweight changes so that things actually feel new and whatnot, which I'd imagine to require an advanced engine of sorts.
Just like most of you, I'd be interested in seeing these remakes as well; personally not as big of a fan of Diamond and Pearl, but they're still great in their own, unique ways.