The Supreme Court case, if there will be one, could be interesting, involving the limits of a state’s rights to determine its own electors. I’m assuming that this will be overturned, but I’m not sure that it is a slam dunk.
Since this ruling applies to the primary, it does not involve electoral votes at this point. The Colorado GOP could choose to forego the primary completely and choose their delegates to the RNC by caucus or some other method. The Colorado Legislature could also choose to select the electors in the general election directly, without having a vote of the public at all.