Which real life location do you think will be used as inspiration for the next Pokémon region? Here are my predictions based on likelihood (not by personal preference):

1. California or a more broadly Western USA region (most likely)
2. Greece
3. Nordic region
4. Island region (either Polynesia or the Caribbean)
5. Australia
6. Brazil

I'm pretty sure we're not getting another Western Europe region in some time after the France, United Kingdom and Spain combo we got recently, with Greece and the Nordic region being the only European countries I can see as a possibility due to their very rich and distinct culture and mythology
I strongly believe we'll be getting USA again, because 99% of its territory still hasn't been used as a Pokémon region, and I see California as the most likely candidate (with Florida right behind)
Since the next generation is the tenth one, I've also accounted for the possibilty of Game Freak wanting to do something completely different for the new region, so I've included Polynesia, the Caribbean, Australia and Brazil because they are very distinct and we haven't really gotten any region quite like them