The only thing is...as has been the case in (neighboring) DC, the law (or really its enforcement) won’t be changed, and every gun owner asserting his rights—if caught—will face a daunting legal battle to assert rights already established by the courts.
There are a heck of a lot of Liberals in Maryland.
If the court frames it as a constitutional right, and we get a President and Attorney General who are pro-2nd Amendment (ie, not Romney, not Obama), then politicians who choose to ignore it would do so at their peril:
18 USC 241
If two or more persons conspire to injure, oppress, threaten, or intimidate any person in any State, Territory, Commonwealth, Possession, or District in the free exercise or enjoyment of any right or privilege secured to him by the Constitution or laws of the United States, or because of his having so exercised the same; or
If two or more persons go in disguise on the highway, or on the premises of another, with intent to prevent or hinder his free exercise or enjoyment of any right or privilege so secured
They shall be fined under this title or imprisoned not more than ten years, or both; and if death results from the acts committed in violation of this section or if such acts include kidnapping or an attempt to kidnap, aggravated sexual abuse or an attempt to commit aggravated sexual abuse, or an attempt to kill, they shall be fined under this title or imprisoned for any term of years or for life, or both, or may be sentenced to death.