You missed my point, I said the market would be in workstation quality cards, I.E. Quadro cards, not gaming cards. Which is what you went on to suggest.
The problem is again, there is no point in pairing a workstation card with a machine like that. It just makes no sense. GPU rendering is still a bit iffy with things like V-Ray and 3DS Max, so you use CPU rendering. The GPU is used primarily to provide RT rendering and provide viewport rendering. Production renders are still pushed through the CPU, as it just has more options for generating the render that the RT renders still lack. I used to use a Xeon thingy at work, think it had 12 cores, 32GB RAM etc. Still would take 45 minutes for production renders, RT renderer would produce a lot of artefacts and just wasn't stable enough to get the job done.
So what I'm saying, is there is no benefit to sticking a Quadro in a machine with 4 cores, it doesn't really make anything faster. And nobody who used a Quadro would pair it with a notebook. So I don't really see a market in the professional side. For Photography/Graphics work, the dGPU can handle these things no problem. So this takes me back to the gaming side as the only viable market, and as explained earlier, the costs involved don't make a lot of sense to a gamer.