We're going to see super APUs, but don't expect them to be cheap. Actually even "APUs" are much more expensive than chipset IGPs of old - they truly added only $5, while "APUs" you have to go up a tier to get them, so you are really paying $50+.
If they are going to be x50 dGPU class, then expect them to be priced like one. Actually if they have advantages like lower power and smaller form factor without the performance loss, I wouldn't be surprised to see them even higher priced.
Why would you sell a product that's superior in every category but price them like they are not?
Phoenix can cost around 50$, per die, on 5 nm node.
Its not cheap, but it will be much, much cheaper than two separate designs, with one to which you have to add PCB, VRM, VRAM chips, and ship it.
You combine both, you move the PCB, VRAM, VRM, shipping costs onto the RAM and Mobo costs, and you saved a lot of money.
Secondly, its still a CPU, and has to be priced like a CPU. The Graphics accelerator supposedly is what you would get for "free".
I think AMD's lineup will consist of three different SKU tiers, based on two different dies, on AM5.
RMB will be used for entry level products, even up to Core i5, like Core i5 6500G, 6600G..
Phoenix without 3dVcache - a tier above it like Core i7 6700G.
Phoenix with Vcache - tier above it, potentially coming sildered to MoBo and with DDR5 memory soldered into the Motherboard, with a steep premium, but offering efficiency, and small form factor, like Ryzen 7 6800GX3D.
Thats my guess, how AMD can play the competitive game.