There are a lot of things in that article, most of which I'm not interested in here. But I am interested that Micron is working on GDDR6, which presumably means that they don't expect HBM2 to take over as the memory standard of choice for GPUs.
As a little background, there are three major memory manufacturers in the world. In the competition between GDDR5X and HBM2 memory standards, Samsung and Hynix bet on HBM2, while Micron bet on GDDR5X. HBM2 offers higher bandwidth for less power than GDDR5X, but it also comes with a higher cost.
So far, the GDDR5X bet is working out pretty well for Micron. It's available in the GeForce GTX 1080 and has been for months, while there aren't yet any commercially available HBM2 parts. They're coming, both in the GP100 chip that Nvidia has announced for the Tesla P100 and in AMD Vega. But they're not here yet.
AMD has said that HBM2 will start out at the top and and work its way down to cheaper markets. That makes sense, as if you ignore cost, HBM2 is clearly the superior technology. Professional markets (Quadro, Tesla, FirePro) aren't very sensitive to production cost, and even a $600 consumer GPU can readily absorb an extra $10 or $20 in cost of production if it gives you a clearly superior product.
The real question is, how low in the product stack will HBM2 go and how quickly? Will it be limited to the top end GPU only, or will it work its way down to the midrange? That Micron is working on GDDR6 surely means that they expect either Nvidia or AMD to buy it, and possibly both.
AMD has said that Vega will feature HBM2. Does that mean only the higher end Vega parts, or the entire Vega lineup? I interpreted it as being the latter. But will Vega itself only be for the high end, or will it fill the whole range of products? If the cheapest Vega-based Radeon card is a $400 card that is much faster than a Radeon RX 480, then that leaves plenty of room for GDDR5X or GDDR6 in the future $100-$300 market. If Vega is going to replace all of Polaris with HBM2 cards even at the $100 price point, then it's hard to see AMD ever adopting GDDR5X or GDDR6.
And what about APUs? Will Raven Ridge have a Polaris-based GPU, Vega-based, or is there not much of a difference other than the memory standard? Will future APUs have HBM2? Even APUs without HBM2 are unlikely to use GDDR5X or GDDR6, as the power consumption is a huge problem in laptops.
And what about Nvidia? Will Nvidia bring GDDR5X to lower cards in their product stack? Will there be a new generation of Pascal cards that adopt GDDR5X or perhaps GDDR6? What will Volta use? Surely the top end Volta will need HBM2 to be competitive, and it's hard to see Nvidia abandoning HBM2 after they used it for GP100 in Pascal. But just because the top end GPU in a generation needs a particular type of memory doesn't automatically mean that they all do.
Once HBM2 has been out for a while and is more mature, the price difference between it and GDDR5X or GDDR6 will probably diminish. Building the big silicon interposer on a process node designed for complex logic, even if it's a very old process node, is much more expensive than building a silicon interposer on a process node designed purely for cheap silicon interposers. HBM2 stacks also need an extra logic chip at the bottom of each stack in addition to the memory chips, but I don't know how expensive that is.
Indeed, if at some point, HBM2 is mature and GDDR6 is not, then it's not automatic that GDDR6 will be cheaper at first. It's highly probable that HBM2 will be better if you ignore cost. And then what happens to GDDR6?