I think such solution is not needed now -- even if all the vendors started selling only locked-down computers tomorrow (realistically I think the fastest transition may take 10 years, you not only need to implement this at motherboard/CPU vendors, but also within all these corporations that have their own servers and thus depend on running custom OSes), you still have loads of current hardware that you can use until it breaks, let's say another 10 years. Should the problem arise in 2035, you will have completely different FPGA/ASIC possibilities available by then, and current FPGAs are no longer manufactured.
I hope it's never needed - but I'm also alarmed by how quickly certain transitions are happening (perhaps I'm just feeling especially pessimistic about the rate at which we're sleepwalking into a tech dystopia because a fortnight after the local supermarket installed a bunch of self-checkout terminals, HSBC announced the closure of over 100 UK branches, including the one I use!) We already have Pluton-equipped laptops with the 3rd-party signing key disabled by default - it's not a huge step further to remove it entirely. So yeah, I hope it's never needed, but "hope for the best, prepare for the worst", and all that!
