Arm's Mali GPUs don't seem very important in the grand scheme of things. They're the choice for SoC makers who don't have anything else. Qualcomm has their own Adreno, Apple has their own thing, NXP buys GPUs from Vivante, Samsung is now going to include AMD Radeons in phones..
Sure but you have to assume that at some point in the future that Nvidia is going to start making those non-Nvidia GPUs very difficult/expensive to use in future ARM designs. They could do this legally, technically through manipulating the reference designs to tightly integrate Nvidia GPUs, cutting support for third party GPU integrating SoCs or any of the above.
