Good point About being a base NVidia product . Like any processor the video card with the processor speed and memory as well as cooling has always been the limits of computing. But this animal has 2 processor and hopefully will be talking to each other for confirmation like an airplane. Tesla has redundancy in many parts of the car.
I am sure Tesla is working on HW3.5 or whatever it will be called but I think that is a separate issue. HW2/2.5 being based on nVidia products have a much higher chance of being obsoleted similar to AP1 than the HW3 FSD computer does, which supposedly is the first product Tesla really designed for the task of the FSD, and which is an in-house design.
So I think it would make sense for Tesla to try and cut HW2/2.5 loose by wrapping up EAP and moving all development to HW3+ (HW3 here including HW2/2.5 FSD computer retrofits), while mothballing HW2/2.5 development similar to AP1.