my bet it is that it only affects the states in the 10th circuit, but could be assumed to be the law of the land, until a case is brought in which case there is only an issue if a different appeals circuit rules differently

Correct, it's only /binding/ on courts in the same District but they are often persuasive when cited in other districts if the decision is well reasoned and less controversial. This one will likely be contested, the circuits have very different ideas about gun rights.