Well, one thing that people have noticed, including myself is...
The Johto games, and the Sinnoh games are extremely similiar... So, it's not like Gold and Silver were forgotten about, because, they recycled a lot of the ideas;
-The day and night sequence
-More methods of evolutions
-Another 2 Eevee evolutions (though it's a little lame that you can't get them until after the National Dex, but, I understand why.)
- There -are- Johto pokemon, you just have to look, ya know?
Well, I think what the problem is, is that people have such a strict opinion on what they want. They want the same exact game as Gold and Silver, however, it's just not going to happen. GameFreaks isn't going to come onto the Serebii forum, and say, "Hey, soandso wants a quillfish, so, we better make a game just like Gold and Silver so they can have that."
And, if they remade Gold and Silver, it'd be a total waste of their time. Why make a game they already made? Well, yeah, they made Fire Red and Leaf Green, but, those games were necassary where as Gold and Silver were not. You can get all the Johto pokemon in other games (of course, this is just their way of getting you to buy more games, thus being a money pit).
However, a lot of features you people miss are actually in the fourth generation. And, I've noticed that, as soon as they recycle these ideas, such as day and night, etc., everybody turns around and complains about them.