I ask a question.
You say wrong question.
My bad.
Wrong emphasis on this question. I propose, that mining isnt needed that much, even now. (Not in Libra, not in proof of stake.)
It becomes more and more anyone who wants to do that may do that, and call themselves something ("I'm a miner!") - but if they are not huge, and I mean huge - conglomerats owning asic or GPU farms, or buying up currency for voting rights they - miners - dont matter at all.
Cut them out today - what harm does it do to your crypto currency? What percentage of earnings do you have to invest into actual people, or hardware. (As most of your earnings are speculative anyhow.)
If that cost moves towards zero... I mean, you have your answer even as of now, dont you?
You might have to guard against individuals owning more than 51% of validation capacity, by going to Best Buy - but the rest you anker in a corporate distributed stakes system - as you always did...
What purpose do miners serve? Currently.
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Or the other way around, there are crypto currencies out there TODAY; where you can get an XP boost, by onboarding (hooking) more of your friends. If that (market making) is worth 2x and more of your 'mining' capability - as dictated by hardware you own. F*ck that hardware you own. And get comfortable with the notion that you as a miner are just used as a pawn in creating the myth - that gold is something valueable - world wide. Because look at that guy - he was a miner once....
(And in reality the people owning the brothels on the mining trail got the actual percentages out of every miner..)
Miners are worth exactly as much as you value decentralization you cant buy otherwise.
edit: Dont tell me FLAME is the only one that believes, that the thing everyone was financing spanish sea expeditions for (the Inka gold!) was the worthwhile thing here...
FLAME looking for the Inka gold, and worrying, that it could become too easy for people to find it... Maybe you could hide it better? Then write a novel about it or something. Call it -
Treasure Island. Then worry about it becoming too easy for people to find buried treasure, or something..