There were 27 years between the release of the iphone 5 and the Cray, and at a $649 release price, it was approximately 50,000 times cheaper.

So, if this was linear, we can all expect 130 petaflop computers around 2043 for around $3,500?

Lots of caveats here though, things aren't usually as linear as all this, and this is very much a back-of-a-napkin calculation.