The next games aren't remakes of the first two game. Why? Because, first of all,
the new games have different plot (well, the story is not the same as the story featured in the first games), different characters, different gym leaders, and so on (i can't think of anymore). Remakes, basically, should be consistent to the story(meaning, it shouldn't be altered and should be almost the same as the original), should have the same characters and gym leaders. (except for Hoenn).
Anyways, I just had to clarify that.