I gave up mining SIA a while back (and switched to a non storage based coin) simply because, I don't see a future for it. I can't see any large company wanting to go through the hassle (and risks) of exchanging cash for SIA then using it to buy storage. Currency fluctuations can have big effects on profitability (Lots of UK businesses after Brexit have seen profits squeezed, or even wiped out after GBP took a dive) Why would a large company already at risk of currency fluctuations increase that risk by also getting involved with crypto markets, and with something as important / essential as storage?
With high speed networks, falling SSD prices (and increasing capacities) along with super reliable HDD's does SIA really have a large scale customer out there? Perhaps content creators could find a use for SIA as an alternative back up space - but the likes of a large multinational with huge storage requirements would probably already have their own facilities in place. Honestly, I don't see enough small scale users to make up the difference.
So, that's why I got out - I don't think the demand will ever match the supply. I think it's important to have faith in any project you're investing in (whether it's buying coins or using resources to mine them, it all counts as an investment!) - I have a great deal of respect for all those who do believe that there's a future for SIA - perhaps you can see something I can't... (or maybe you are just smarter than me!) - however, for me - I think there are better options out there.