Actually, you could also say that future people might have a very hard time earning a living by posting on SN. It's all supply and demand. If posting great content here in SN gets you a significant reward, many great content-creators who are now asleep because there is no platform that motivates them to get rewarded might join SN and start posting. This will translate in more great content available, and a harder time to get your post rewarded since there are so many other great posts. A free market balancing itself, mostly.