ARM SOCs have their place in mobile devices, but I don't really see any ARM SOC as having been viable for the consoles. On the flip side of the coin, i'm not trying to be obnoxious or anything about the console CPUs but....they're not great CPUs. Objectively, they're bad CPUs by any metric measured for 1080p gaming. I'm thinking that MS and Sony really wanted a 1 chip solution. Had they gone another route their costs would have been substantially higher with an NV/AMD graphics chip and intel CPU, certainly that would have given both a massive performance boost but at what cost. I don't know.
I really do think the situation with the consoles isn't ideal as a consumer. The CPUs are rather weak. Again, not trying to be facetious but it is basically true - these are the same Jaguar cores used in the recently released AM1 APUs right?
I think both MS and Sony went overboard in trying to shave costs, they weren't willing to take losses for years as they did with PS3 and the 360. I mean they could have used an AMD or NV graphics chip with an intel low power many core CPU. Would the end result be better? Yes. Heck, there are ULV core CPUs that are pretty darn powerful. Certainly more powerful than the Jaguar cores in the consoles. And more expensive of course. I don't see expensive as an issue, though, I mean the PS3 was obscenely expensive at launch. But still sold really well.
Really a no win situation. The consoles are relatively underpowered with especially the XB1 struggling to even do 1080p. And the PS4 isn't miles better. Oh well though. It is what it is. I would have preferred a different CPU regardless of what graphics were used. Clearly there are some issues with the consoles that prevent them from meeting their full potential. But, ARM SOCs weren't even in contention. Regardless of the AMD SOCs, they're still more powerful than the ARM SOCs of 2012/2013 or so. But it would have been so much better to get a 2 chip graphics and CPU solution for these consoles, even if they retained AMD graphics. They would be so much more powerful had sony and MS done that.
I'm thinking something like a GK104 mobile Kepler, or perhaps an AMD 7870 level GPU in addition to a ULV core i5 intel CPU would have made these next gen consoles much more beastly. But we have what we have. A weaker 1 chip SOC solution. And yeah ARM SOCs couldn't possibly be considered for these machines during design. I'm sure that will change in the future as ARM SOCs are really getting pretty powerful now. But not during the design of the consoles they weren't.