The math is simple and compelling: America is becoming a less white country, and unless white people can figure out how to quit dying, the Republican Party is facing a crisis.
What does this have to do with the Electoral College? Under the EC, it is possible, though increasingly difficult, for a Republican candidate to win the presidency without substantial nonwhite support.
As long as the Republican Party believes it can win as an overwhelmingly white party, it will never feel the political pressure to change. Parties rarely voluntarily change as part of some long-term strategy to improve future results. Parties change because they are facing defeat and/or extinction if they don’t change.