SIA coins will always be mined.. In some years at a fixed and stable but lower than today speed.
Today there is no real busniess case for investing heavliy in storage equipment - not because the low value of the COIN, but because there is no demand.. it took me 2-3 months just to get 200GB rented out, and I have a stable host with quick access and attractive collateral.. Once the demand is there there will be a price point - that price point is competing with other services denominated in any fiat currency - thjat is the real comparison..
there is around 2,3% of utilization of all space available, that menas there is a heavy excess of space that no one really are hiring at the current pricepoint - not because it is expensive - it is dead cheap, but because of lack of having it conumsed in an easy way...
Storing just a single file in the SIA net work still requre you buy coins (which is not so easy either), get the wallet and the client and kin of understand the tricky bit of alocations... all very nerdy, IMO.
Services around this need to come to a stage, where it will be the drop box or one drive of distributed storage on many platforms - that stage is relatively far away - look at the road map, but here is some good thinking put into it already.