If people start posting directly from the website splintertalk.io and start forming a community, the price of the token is already going up.
And of course, there is a monster-curator that has 33 million spt in delegation, making curation something very centralized. (Well they could give upvote only to people who post in the splinterlands community)
I'm not sure that posting directly from the official site is needed for SPT to rise in value. I believe what is needed is an in game use within the game of Splinterlands. Its my opinion that the Splinterlands/SPT community is one of the stronger ones on HIVE.