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Anybody whose own 10 or more bitcoins should buy one miner machine - what do you think ?
No. I have some silver coins, but no silver mine.
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If you want lower fees then use segwit and tell others to use it also.
Segwit does not solve the fee problem. This is simply mis information. A reduction in fees of 30-40% is not material.
The levels of fees have utterly destroyed large parts of the bitcoin economy, and segwit does not change that. Cutting fees to 1/10 of current levels does not change this.
Fees would have to go to 1/100 - 1/1000 of current levels for the old bitcoin economy to arise again.
I'm talking buying beers, pizzas, tipping on line, Starbucks gift cards, etc.