Wait until one guy releases a walkthrough on the the two pins you cross or the steps to remove some chip and add a new (or worst case blast some part of an SOC with a laser), then all the geek friends of those pretty criminals will take a stab at it.

Its not like the criminals themselves are doing much with phones and laptops they steal currently. They just sell them for pennies on the dollar to some shop that won't ask questions. The shop wipes the machines, resets keys or does whatever they will do. If the procedure is more involved the shop will pay less for iPhones to offset their costs, which could still deter thievery, but we can't expect it to always be "literally impossible".