To me Pokemon SM were set up for a sequel. There are lots of unresolved sub plots and overall feel of this region is that it is still developing. If we are about to get just a third version, it would be a massive letdown, personally.

>because of newly built pokemon league a lot of people came to alola and made it even bigger (more buildings etc.)
>ultra dimension that can be explored in a bigger way than just one cave
>trial captains get their own gyms with new trials inside them or just stay with old school trials but still get their own gyms
>necrozma

It's just screaming for a sequel, much more than Black/White.