>>536171719
At least in the short term I'm not that worried. I'm guessing the flood of new content is going to keep people engaged for at least a year, even if they have no plans for wipes or any sort of seasonal stuff in place.
If the mechanics are in place to stop players from amassing wealth, there's a bunch of new long term goals like the prestiges and they patch in new items or map expansions every couple of months I'm pretty confident the game will stay active for a long time.