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I guess the build chain for complex international products (cars, smartphones) spans multiple currencies. Maybe it becomes worthwhile for Samsung, Toyota or BMW to use Bitcoins instead. Now it makes sense for them to do some mining just to secure the blockchain. The primary goal would be security not profit.

(I don't consider that scenario likely, just possible)

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I see the reasoning, especially from one steeped in the coinosphere, but this one seems best classed as very unlikely.

Currency exchange is a solved problem with costs and overhead that is very likely much less than going into the "securing the blockchain" business, even as a side gig.

How much "securing" would they need to do anyway? Just a little to help them sleep at night?

Not to pick on you particularly, but in general there is so much mushiness and hand waving in the coin space about what exactly is the value proposition other than to the person selling you the coin at a profit.

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