For Xbox Series X and PC, the main map seems small and lacking character. By adding Mexico City like environment to the main map for people of advance hardware is probably what the game really needs to stay competitive with the open world genre. It doesn’t have to be a direct 1:1 match, but getting the feel of the city would be great. Big city is actually something the map lacks.
It may require leaving the old generation behind, but maybe they can still play a light version of the game until they decide to upgrade.
Many games of open world have been able to add on, and hopefully Forza Horizon 5 can too, so it won’t die too soon.