I don't think they do if you're just referring to how difficult it is to pull off a 51% attack. Assume the status quo is that it costs X to secure 51% of the hash power. If there is a new ASIC that can hash twice as fast with the same energy use, then suddenly it will cost 0.5X to secure 51% of the hash power. But if the price of Bitcoin remains the same, then miners will have an incentive to double their hash power as that was their breakeven point before. And so now you've gone back to the previous status quo. Assuming the attackers have access to the new ASICs, it still costs X to 51% attack the network.