It was unreasonable to have a 55mph speed limit especially for those long expanses of open and often straight highway in our larger states. (Montana and Texas come to mind but many others fit the bill as well.) But guess what? Washington did it! And all in the name of conservation.
Now in the name of whatever, could they restrict a small hobby for the sake of getting your crap to you faster? Learn from history.
And yes, the 55 was eventually turned back. But not until the majority of the public and law enforcement and the courts ignored it. And when the reason behind it, save gas, was proved to be the hoax it was. So ask yourself, will the "majority" of the public, law enforcement and the courts bother standing up for and defending some one million (less than point 3% of the population) playing with their toy airplanes? Put yourself in their shoes and ask, what's in for me?