Is your answer to "where can I buy a TPU" that you can't buy a GPU either? That's a new one.
First of all I don't understand how that's an answer. Second of all it's laughably wrong - I can name 5 firms (outside of FAANG) off the top of my head with >1k Blackwell devices and they're making very good money (have you ever heard of quantfi....). Third of all, how is TPU going to conquer absolutely anything when (as you admit) you couldn't run one even if you could buy one?
I'd never claimed that "TPU is going to conquer everything," it's a matter of fact that the latest-generation TPU is currently the most cost-effective solution for large-scale training. I'm not even saying that NVIDIA has lost, just that GPU's have lost. Maybe NVIDIA comes up with a non-GPU based system, and it includes programmable fabric to enable compute-in-network capabilities, sure, anything other than Bluefield nonsense, but it's already clear from the engineering standpoint that the large HBM-stacks attached to a "GPU"+Bluefield formula is over.