[dragonwriter]

> 51% attack is now outrageously prohibitive.

If there isn't a diversity of commodity suppliers of the best ASICs, then there are obviosuly actors for whom it is not prohobitive if a motive exists. Such actors exist even if there is such a diversity, really; the assumption has really always been that no one will have both the capacity and the motivatiom for carrying out a 51% attack.