People will always mine because they will be rewarded with transactions fees. When BTC is $1,000,000 even a tiny Satoshi reward will make it worth it. Many blockchains like Waves and Ripple operate just fine with no new blocks being mined.
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If you like centralized systems like Ripple and Waves, why not just invest/use Visa or ApplePay?
Not sure how Waves is centralized. Either way the point is that you don't need to have a PoW system.
91% of last 1000 bcash blocks were mined by one miner - and you're talking about centralization in bitcoin?:D