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>Day/Night inexplicably cut in Gen 3
>implying it wasn't cut because of the Gen 1 remakes
Think about it. The Day/Night cycle returned in Gen 4, which is also when Johto, the original game with the Day/Night cycle, was remade. Gen 5 introduced the completely new Season cycle, and didn't get any remakes. And then Gen 6 had no Day/Night cycle, and got a Hoenn remake...
The time cycle coincides with the remakes, meaning that Sinnoh will be remade in the next gen to have Day/Night cycle again.