GPU Evolution Nvidia

Please , lets not buy into ever marketing hype. AFAIK GPUs were invented for driving virtual cars

The money didn't come to Nvidia immediately. They were in exactly the same spot as ATI when they introduced hardware shaders in GF3 and later pioneered GPGPU on them. Moreover, ATI sometimes progressed in huge leaps (such as Radeon 9800Pro which was miles ahead of anything from Nvidia). ATI and then AMD just ignored general purpose massively parallel computations for a while, and then didn't know what to do with it, while Nvidia had a vision and actually implemented it.

At what point will GPUs befall a similar fate?

They tested the waters with GPUs. after nobody complained at all, they just moved to CPUs.

No, it lives on in GPUs etc, see iPad pro / nvidia

GPU conspiracy or just the side-effect of the decline of Intel?

AMD had more powerful GPUs for compute than NVidia for all but the last 2 cycles, and yet it didn't materialize.

I remember having this argument 10+ years ago. Discrete GPUs like what gamers were buying were thought to be a small market with no real routes to bigger markets. Workstation and HPC could be addressed with entirely separate product lines, hence the disaster that was larrabee. It was Nvidia that pushed the unified workstation/consumer architecture. ATI reused core architecture, but they had very different software stacks above with their firestream stuff.

Because gpu drivers were so much better when there were six vendors?

It ain't luck: people like me were buying nvidia cards to run OpenGL on linux decades ago and nvidia was already coming to my supercomputer center to sell us on early GPUs in ~2007. They are the only company that took high performance GPUs seriously for a long time. Intel didn't do all the things nvidia did.