Without reading the specific reasoning in the majority opinion, the Court's jurisprudence for about 30 years or so has drawn a pretty clear distinction between the cons utionality of prayer in forums where the likelihood of coercion is small (i.e., public forums where mostly adults who understand that they can walk out or protest without meaningful reprisals and where parents can remove children if they would prefer they not be in that environment) and those where the likelihood of coercion is high (i.e., schools, where impressionable children may not understand that they can opt-out or protest and where participation might be expected because of peer pressures or fear of gaining the disapproval of teachers (for example)).
Unless there's something in the majority today that suggests that those considerations should be ignored, I'm personally not terribly concerned with a drift toward organized school prayer.