Apart from half of the points you state are just untrue, do you know of any feasible solution?
Bigger blocks don't solve the problem. DAG structures don't solve the problem.
IMHO a proper decentralized secure base protocol with second layer scaling beats any other proposals we have now, they all decrease decentralization and/or security at the base level.
dash seems so solve eg master nodes can afford to brute force to with hardware
But aren't master nodes open to sybil attacks? How do we know that Dash's master nodes are not controlled by Evan Duffield and his friends from the secret instamine? Because it is possible that they do control more than 50%.
I remember this issue was already raised before but with no convincing reply from the Dash development team.