That's no excuse.
I could care less for anniversaries.
You don't just break a pattern.
You just don't.
Either make 2nd games for all regions or don't make 2nd games for regions at all.
Here's a handful of patterns broken by Game Freak:
-# games per generation: gen 1 and 2 had 3 games, gen 3 suddenly had 5. Then gen 4 had 5 games and suddenly gen 5 only gets 4, which has continued since then.
-remakes vs 3rd game order: Yellow was directly after it's originals, Crystal was directly after GS, but Emerald came after FRLG, and then Platinum came directly after DP.
-one generation per console: generation 1 was on gameboy, gen 2 GBC (although GS were still compatible with , gen 3 on GBA, gen 4 on DS and suddenly gen 5 is still on DS
-3rd games: Gen 1-4 had a traditional 3rd game that was like a better/finished copy of the original. Gen 5 got sequels; completely different games that continued the story instead of changing it.
-naming games after colors: Red, Green, Blue, Yellow, Gold, Silver, ...Crystal?
-naming games after stones: Ruby, Sapphire, Emerald, ...FireRed? LeafGreen? Ok, these are remakes; maybe they don't count. Diamond, ...Pearl? that's a stretch. Platinum? ok, nope.
Game Freak has been breaking patters all along, with more and more patterns broken recently. The only patterns they seem to be sticking to anymore are keeping an entire generation on the same console instead of releasing games for the newest console and releasing one remake per console. Yeah, it sucks that we didn't get a 3rd game or continuation of Kalos, but we can't expect that Game Freak will stick to any specific patterns. They've even said they like to keep us guessing.