There is absolutely nothing to be done on our level about this.
I'm fairly convinced this is systemic issue that can only be solved by redesigning
almost entirely modern cpus and computers architecture.
I can draw a parallel to approximately all Intel cpus which are know to have a dedicated "mini cpu" called "Minix" which is an absolute "black box" and have been found to be vulnerable for to a wide variety of attack for nearly decades...
Not only we need to redesign computers and cpu architecture but we desperately need to make that entire process and knowledge open source , available to all and more transparent.
Today this entire knowledge is the hand of few gigantic corps whom are keeping it to ensure their monopolistic position.
Here's hoping OpenRISC takes off!
What exactly is "our level"?
Or, if that is too complex, there could just be a bunch of breadboarded ICs capable of networking. There actually are real-world examples of such machines exposed via telnet, e.g. http://www.homebrewcpu.com
And all the performance beasts, while surely indispensable, could just enjoy their air-gapped solitude. Are there any massively parallel supercomputing tasks whose results couldn't be summarized and reduced to mere text, which is not too hard to move over the airgap manually?
Video decoding? Games? You know, the major use cases for custom highly patented hardware design?