Just like adventures shaping the world, so should player actions going forward.
It is amazing what has happened with New Golden Sands, I think it would be awesome for other outposts to get upgrades as well.
I think they should receive upgrades based on how much business is conducted there, we sell millions of gold worth of loot to these places but they all still look the same, so what are they doing with all their profits?
With each season, each outpost can receive upgrades reflecting the amount of gold they received during the last season. SoT needs a thriving economy and a thriving world to reflect this economy. I think New Golden Sands should be the biggest of all, but others could get some love and attention as well.