> What still worries me is that ramp up time for fabs like these are on the scale of years - if we assume a fab started right now, we'll be making semiconductor

> What still worries me is that ramp up time for fabs like these are on the scale of years - if we assume a fab started right now, we'll be making semiconductors in ~2 years at the earliest (very optimistic)? TSMC announced the Arizona fab in May of 2020. They estimate it will be at volume production by 2024. The challenge is that it's not just building the fab, but also the lead times for all of the equipment involved, getting the specialists in to install+calibrate, then doing some initial runs to work out issues before going to volume production.