If you'll forgive the autism I've been thinking a lot about the announcement of Pokemon Colosseum and its sequel on NSO. Why the hell would they rerelease these games if half the functionality is going to be unusable? The entire point of the game is just to get cool, rare (for gen 3) Pokemon to transfer to the "real" games, or to battle with your main Pokemon on TV in full 3D when that wasn't part of the main games. Now, you have:
-No connectivity to the main games for battling
-No unique functionality in battling in full 3D, all the main games let you do that already
-Nowhere to send your purified Pokemon to
-No Home support because sending Pokemon from these games would permanently remove them from the save file and you'd have to restart the whole game.
-No reason to purify Pokemon even if they did add Home compatibility because they aren't rare anymore

You're left with a mid at best RPG with bad old battle mechanics, and a main menu that half the options don't work. Why bother?