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.
Market Cap is irrelevant. Yes GPU mining will die very likely before the end of this year for those paying more than 10 cents a kw. The reason being the constant flood of new miners coming online is rapidly increasing the difficulty of all the coins. If it weren't for the rapidly increasing prices, it would be dead already. The simple inescapable fact is that gpu mining depends on increasing coin value to sustain profitability. If prices stop rising, difficulty will still keep increasing for a while, profits will plummet, anyone paying more than 10 cents a kw will be losing money. Ebay will be flooded with high end video cards so you will be lucky to get back 10 cents on the dollar of what you paid for your rig.
It will happen. There can be no doubt about it. Maybe not this month, maybe not next but the current boom times will definitely end. I think it's optimistic to hope to maintain profitability through to the end of the year, but we might be lucky. Those who got set up a few months ago, have done very well. Anyone building a rig now I reckon has at best a 50/50 chance of getting a ROI.