Or Game Freak could make the Hoenn remake it own game and charge you full price for it.
Looker never said that N was in Hoenn but rather said that he was in another region.
No just no, Johto was weighted down by Kanto as the trainer level was a far too low and made the game too easy.
Also Mistralton's Airport was really to hammer in the point that Unova is far away from the other past region, it also show case that Mistralton Gym Leader was a master of flying type pokémon.
Have to agree with all of your counterpoints. Plus, I doubt they could fit all of Hoenn + upgrades/new stuff and Unova + upgrades/new stuff all on one cart. Unless they get military hardware for the carts but then the games cost would skyrocket and GF would lose money.