Mining Farms gaining more and more percentage of the total hashing power is an often discussed subject here. My theory is that in the event of an already large Miner gaining enough control of the Mining that a 51 percent attack becomes more likely and easy to accomplish than we would expect and like, Bitcoin would have to suffer a Hard Fork which would expel any sort of equipment other than CPUs and GPUs so the power could be redistributed among the community instead of a majority of it being distributed among few giant Miners.
I do not know how much of a solution or how feasible this would be. But say this was a thing and Bitcoin became GPU and CPU mineable ONLY like it used to be many years ago.
What would happen? What are the risks we would run into?
With the risk of an increase in the price of the GPU and CPU upon sale.

This has already happened several times with the GPU - during the rise in the price of cryptocurrencies, like ETH. A sharp increase in demand for GPU and CPU will create a shortage and an increase in cost.
From the point of view of decentralization, mining on CPUs and GPUs would be preferable, which would allow even ordinary users, just with a regular PC, to be part of the
BTC-system and receive their small commissions from this.
The question is, how can it be technically possible to make ASICs impossible to use? It seems to me that it is no longer possible to go back to the old ways and simply abandon mining farms.