everything has risk, but the new mining graphics cards will have 90 day warrentys for a start, making the gaming cards worth  more, mine have 3 year warrentys, amongst over things, they are just talking about removing things and making them cheaper, not 50 times more efficient in hashing.

Also 2013 was light years away, the market was 1.5 billion for all coins, the current market cap is 100 billion, do you really think gpu mining will disappear overnight due to new mining gpus, then you are stupid.

my 5 gtx 1070 generate around 25 dollars a day, so 120 days they have paid for themselves. there is still demand for gaming cards due to vr etc.