How long until large SSDs become the same price as equally sized HDDs?

No one can predict the future, and flash memory prices are very much subject to supply/demand and boom/bust cycles. They are well within "striking distance" already, though I doubt they will ever truly match magnetic storage on $/TB.

Simple economics tells us that since SSDs have advantages over HDDs (speed, physical size, durability, energy consumption), and HDDs have zero advantages over SSDs (other than cost), then at the same price per TB very nearly zero HDDs will be sold since they are functionally equivalent. In other words, the price/TB of HDDs must always be lower than that of SSDs, otherwise HDDs will not be produced.

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Simple economics tells us that since SSDs have advantages over HDDs (speed, physical size, durability, energy consumption), and HDDs have zero advantages over SSDs (other than cost), then at the same price per TB very nearly zero HDDs will be sold since they are functionally equivalent. In other words, the price/TB of HDDs must always be lower than that of SSDs, otherwise HDDs will not be produced.

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I should’ve asked the question in a different way. Ultimately I’m wondering when, or if, an 8tb SSD will cost about $215? which is more or less what an 8tb HDD costs today.

I think you'll see 8TB SSD for $200 in about five years.

...and then the question the OP will be asking is, "When will 'X' become the same price as equally sized SSDs?" And the circle continues .