One thing to keep in mind is that the new supply of HIVE tokens doesn't fluctuate with the number of users/authors as you seemed to imply. The new emission rate is static regardless of the number of authors/posters/curators etc etc etc. The current emission rate is roughly 8% and dropping by roughly 1% each year. This emission rate fills up a reward pool that is then shared by all the authors/curators.
RE: Economic Problem With Hive