I don't have anything to offer regarding how the MD lower and district courts will probably view it, but earlier to day I stumbled onto some discussion of an unrelated matter on the Maryland Shooters' forum and this case was mentioned. Reference was made to two older cases:
Murdock v. Pennsylvania, 319 U.S. 105, US Supreme Court (1943):
The purported essence of this one was cited as the statement that "No state shall convert a liberty into a privilege, license it, and charge a fee therefor."
Follett vs. Town of McCormick, S.C., 321 US 573 (1944)
I have not yet read either of these, but it would be great if one of you lawyer types could check them out and let us know if they seem to provide encouragement for the good guys.
Does Gura cite either of these cases?