I do not know exactly, how the mining difficulty is set up, but to my understanding, more and more transactions are possible with not so fast growing energy eff

I do not know exactly, how the mining difficulty is set up, but to my understanding, more and more transactions are possible with not so fast growing energy effort. And the number that is really interesting is the number of transactions per energy unit. The second argument is something that is independent from the energy problem. The danger always exists, that some entity is taking over the blockchain.