Older hardware will naturally get cycled out of use by exponential-like decay; it won't ever go to zero because of legacy requirements and retro device enthusia

Older hardware will naturally get cycled out of use by exponential-like decay; it won't ever go to zero because of legacy requirements and retro device enthusiasts, but it will be basically zero for most people given enough time. Inexpensive hardware will just stay with the cheap subset of USB-C without fast charging, which is perfectly fine.