As does Bitcoin for now, and similarly to gold, the amount that it inflates by will theoretically decrease until the supply eventually stops increasing (although in gold's case, this will never quite happen and there may be interruptions such as mining gold on different planets).  

It's not the miners' rewards that are the main concern devs have about increasing the block size.  It's the potential bandwidth and storage demand on nodes.

A fork to increase the supply would also not garner any support from the economy as users' coins would be less valuable in the future as a result of the fork.