No he's taking it because there is a split in opinions in two separate circuits. The Supreme Coutt is more or less obligated to take the case to settle the law.
I am not optimistic. There are only four justices who give a damn about the what the framers thought about this amendment and what the original intent was. This one could go very badly for our second amendment rights.
...but it may be that ALL 9 Justices wish to remain alive during their stint in DC! If law abiding citizens are again allowed to defend themselves, fewer thugs will be carrying (as it gives them no real advantage, and serves only to increase prison time if caught in their lawbreaking activities). Fewer thugs carrying, less chance of a Justices’ own ribs being at the pointy end of a pistol.