Here is an idea for Icon circulation supply and ICX burning model. ICX could migrate from inflationary model to deflationary model.
In current stage we have inflationary model for use to build the system and for development, network growth etc. Later, we migrate to deflationary model, to increase value of network.
ICX could be burned from network fees but also from non productive system. For example non productive p reps.
Please note that this is just for now an idea, but maybe it could be good one if modified.