If yes, when do you think it could happen?
Would there be any ideological shift in the most-populous areas of Idaho for this potential?
It would be fun to see a winning Democrat carry Idaho. But, that hasn't happened since 1964 and, before that, 1948. The state used to routinely carry for presidential winners during the first half of the 20th century. (As did a hell of a lot of states.)
The nature of the general-election campaigning, not just from Democrats but also Republicans, would have to change in order to possibly move states nowadays considered remote.