My first reaction was to ask: 'Why would not these technologies (acquired from Intel-Phi, Altera, Nervana, Movidius) not be successful in their own niches?' No

My first reaction was to ask: 'Why would not these technologies (acquired from Intel-Phi, Altera, Nervana, Movidius) not be successful in their own niches?' Now I understand that it is easier to coalesce around a champion technology and too hard to navigate around optimising multiple methods. But I'd expect that the differences between them are so large that they would have their own niche implementations.