Hmmm. That’s a tough question.
Finding a potential POI, or a current Wayspot, and snapping a picture or two can be interesting, fun, challenging, etc. It’s sort of its own reward, in addition to being a component of the Wayfaring process that may also feel rewarding.
I don’t have any such feeling of affiliation(?) with the quasi-cinematic activity of scanning. I suppose I can imagine a role-playing thing within Ingress that might encourage scanning, though I have never tried that game.
Either the task must be given meaning, or the reward has to be significant enough, or something has to change, or nobody is going to be motivated.
I’m not sure what would make it fun, meaningful or lucrative enough to make me want to do it.
Perhaps if the photosphere became somehow a part of the game environment?
Presently, in PoGo, the primary photo of a spot will appear as the background while you are interacting with a gym. It’s as though the photo were stretched around a part of the inside of a dome, with you looking from inside.
If I knew how to create a ‘good’ scan, and knew that everyone would enjoy it when they visited, and was somehow compensated and/or received feedback about it, perhaps that could lead to the desire to create and improve the virtual tourist spots.
I dunno. Just spitballing, but that’s the best I have come up with.