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Would you guys prefer if the Isle of Armor was usable in the game before finishing the elite four, adding it to the main story thus adding 100 Pokemon to the game and more content if you replay it (which can now be easily done in a new profile and the home app.)
Or do you guys want to continue your adventure off from being a champion thus beginning level 80 content, locking it away from the player who obtained the level 12 slowpoke.
Bonus Option is the game only allows you to use Kubfu as your starter and from there you build a Isle of Armor team to finish the Dojo challenges from Mustard.
Tell me what you want, not what you think Game Freak is going to do.