This ruling brings the electoral college back to its constitutional roots. The EC was expected to be a deliberative body that voted for the best person free of the "emotions" of the campaign.
Still it will continue to be incredibly rare for an elector to vote against the state result.
The College cannot be a deliberative body, as the electors of each state meet in the capital of their state. That is a constitutional requirement. There is no communication between the electors of two different states.