So every drone that has been purchased without these devices can only fly 400 ft and must still have an internet connection.Stocking up only works if the old drones would get grandfathered. They won't.
Kinda messes up the Autel Evo 2 since that will be similar in which you do not need to fly with a phone\internet connection.
I have also heard that this will take up to 3 years to actually come into law. By then they will find other ways to use the loop wholes.