First, segmondy didn't attribute future low GPU prices to a cryptocurrency crash. Second, it isn't necessary for a crash to happen to collapse demand for GPUs.

First, segmondy didn't attribute future low GPU prices to a cryptocurrency crash. Second, it isn't necessary for a crash to happen to collapse demand for GPUs. Bitcoin isn't driving GPU demand; Bitcoin is mined with ASICs. Ethereum is mined with GPUs, a consequence of deliberate design. However, when `Casper' lands (Ethereum's Proof of Stake scheme) mining will end, and so will the extreme demand for GPUs. If that happens Ebay will fill up with thousands of discrete GPUs and you'll buy them with a song.