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Captain_Yuri said:

It certainly won't be until ps6, that's for sure if it even happens. Backwards compatibility won't be too big of a deal because they are going from x86 to x86 and they have access to Apis and such. This won't be like going from cell to x86 or powerpc to x86.

MCM design won't come into affect for ps6 generation imo. MCM has it's own set of quirks that only makes sense if you are scaling up very high end GPUs. While the GPU inside of the ps6 will be leagues better by todays standards, I don't think it's likely that it will be using MCM design similar to how the CPU inside of the PS5 is monolith despite the desktop Zen CPUs being all chiplets. But we will see since it's too soon to tell.

Instructions can change drastically generation to generation and break compatibility.

Case in point... 3D Now! is no longer a thing in modern AMD CPU's... So those instructions dedicated to those vector and floating point operations cannot operate or require emulation.

GPU's also undergo significant ISA shifts over the generations which can also break compatibility if you don't abstract.

JEMC said:

But even with all those pros, it's very difficult that any of them leave AMD, because they've treated with the otehr two in the past and it didn't work well for them, plus AMD has been a very good partner for them that has been willing to tweak and modify their designs to suit the needs and demands of both Sony and MSoft, and in business that openess to work together is very welcome and important.

The reason why Sony and Microsoft won't leave the AMD nest is actually rather simple... Price.

AMD simply offers a package that has overwhelming benefits in regards to price/performance that simply cannot be matched by an Intel/ARM+nVidia equivalent.

Captain_Yuri said:

Unlike RDNA, Arc as an architecture can actually go toe to toe in feature set against Nvidia but the problem in the PC space is driver support.

Consoles also use drivers.

Captain_Yuri said:

I do agree that it's very early to call it but honestly, this is their third attempt and I think the strengths and weaknesses for RDNA is clear. But yes, a lot can change by the time ps6 comes out.

I would be surprised if RDNA is a thing as we enter the next-gen.
AMD is trying to iterate a little faster and more significantly compared to the GCN era... And they need to in order to keep pace with nVidia.