Do you think XMR mining can structurally (trustless) stay decentralized?
Nobody knows if it can stay decentralized in the long run. Last month
Minexmr.com pool had more than 45% of the network's hash rate Today it's down to 38% but even then If minexmr.com was to control 51% of the network's hash rate. It's just a mining pool consisting of different miners. So if they wanted to attack the network as a pool, I think to would not be possible ( some miners would obviously avoid the dubious act). I think it would only be possible if the power was controlled by one miner. So as of now, so long as there as so many miners, the network is decentralized.