No. The decision states that:
The MA SJC says the lower court judgment was in error for two reasons. The first reason is that the 2nd Amendment has not been incorporated. Even if that first reason goes away, due to MacDonald, there is still their second reason:
DC law required that the gun be locked up at all times. MA law allows the gun to be unloaded and unlocked, provided it is under your direct control.
SCOTUS ruled in Heller that the DC law was unconstitutional in part because it prevented you from using your gun for self defense in the home. The SJC is pointing out that MA law does not prevent you from using your gun for self defense in the home. In MA, you can carry your gun around your home, loaded on your hip. In DC, you couldn't.
So even if MacDonald goes away, the SJC has effectively already ruled that the MA storage law is consistent with the Heller decision.
This could still be challenged to help clarify Mass law, or even over turn the gun lock law all together, it all depends on the lawyer and how the case is argued.