Will the Supreme Court rule on the decision by Colorado and Maine to remove Trump from the primary ballot and how would they decide?

I am pretty certain the court will take up the case. There has never been a case involving the 14th Amendment. I also think they will overrule the decision and, as much as I dislike Trump, I think that may be the correct way to go.

Even if it is certain that Trump led an insurrectiion and the 14th Amendment prevents him from becoming president, the state Republicans should still be allowed to choose him, as foolish as that decision may be. It is bothersome to think that the federal government can interfere with state primaries.

Consider the following. Several states are part of a movement to have states join them in giving their electoral votes to whichever candidate wins the popular vote. They will not do this until they reach a point where the states involved have a majority of the electoral votes. This would in effect eliminate the electoral college. Should this be permitted? Absolutely.