Safecoin are recycled with use. In order to put data on the SAFE Network, the user must pay in Safecoin, which the network then “burns”, allowing for the creation of new Safecoin to be allocated as farming reward.
Safecoin are divisible. My sense is that price per PUT will fluctuate in response to data storage supply (i.e., resource costs and capacity) and demand (i.e., willingness to pay and resource need). Theoretically, 1 Safecoin could buy exponentially more data in year 10 then it could have in year 1.
In light of the points made above (along with other factors), it will likely take decades (if ever) before the max supply of 4.3B Safecoin exist. As has been mentioned, many community members have explored and discussed this topic. For example, I have hypothesized that.