And in the question of mass adoption PoS wins hands down. ASIC miners will never be widely adopted. It's become a planned obsolesce scheme, at its basis. Those chips are junk and can't be used for anything else once they pass the end of their shelf life. Being able to stake on your tablet or mobile device is going to be the most important factor in destroying the grip mining cartels have on the crypto economy.
Once the staking Android wallet is developed mining is finished. That is the writing on the wall, as I see it.
Ha. I am presently researching whether anyone has a full node bitcoind running on a Linux smartphone.
CPU capacity on a multi-core smartphone already exceeds what Proof-of-Stake requires. Likewise for RAM regarding the flagship Android phones now, and ordinary phones in a couple of years. The blockchain is about 20 GB today and could fit on flagship Android phones now. Furthermore, Bitcoin Core developers have plans to prune or otherwise compress the blockchain for the purposes of validation.
From my own experience running a full node, network bandwidth is the most precious resource. Propagation of new blocks, and of the entire blockchain for new mobiles entering the network requires much symmetric bandwidth, depending upon the number of permitted peer connections.
In a possible world, every smartphone is a Proof-of-Stake full node. There would be billions of them in the Bitcoin Network rather than the less than 10 thousand full nodes nowadays. It is fair that only block-validating, and blockchain-maintaining wallets receive their annual 10% bitcoin dividends. These dividends, given the higher prices for bitcoin that I expect with Proof-of-Stake, would be sufficient to pay for the cellular data bandwidth consumed. Or consider that the full node smartphone client could connect to the network only when WiFi is the connection - and receive a diminished bitcoin dividend in proportion to the time spent securing and maintaining the network, effectively receive annual 5% bitcoin dividends for coins held in the smartphone's full node wallet connected 12 hours each night to the owner's WiFi.