This game is in a dangerous territory because it doesn't know where to go.
Pre-raid days focused on delayed gratification of walking and grinding to power up and eventually have enough candy to evolve. The introduction of rare candies and raids have negated the catching and buddy system.
I think Niantic is hoping that communities develop from raids (as well earn them a lot of money), but eventually you will run out of Pokemon to release.
Ideally I would like them to expand on the sand box, rewards for catching, a social network, and a focus more than raids.