Why do people think WA/OR will trend Republican?

[Virginiá]

Basically they eventually see the end of the Southern Strategy after Trump.

The Southern strategy has been refuted by many scholars. 

http://www.nytimes.com/2006/12/10/magazine/10Section2b.t-4.html
http://www.claremont.org/crb/article/the-myth-of-the-racist-republicans/

Personally, I've much preferred the theories stated by the Claremont link for some time now, but at the same time, I don't think it changes some of the rhetoric or policies pushed by the GOP. It doesn't have to be some sort of cohesive strategy all Republicans agree to implement with a wink and a nod. It also doesn't have to mean that this dog whistling is even necessary for Republicans to make the same gains, but they do it anyway because they think it's necessary.

Also, I have to admit, for some people who stress the points made in the Claremont link, I think it's kind of ironic when it comes to this part:

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Part of the theory is that young Southerners were trending to the GOP and basically stayed that way as they aged, thus turning the South more Republican. Yet, when myself and others on here state the same processes at work with Millennials and other young(er) voters, it's dismissed as silly "demographics is destiny" and "people won't always vote the same way" or "people get more conservative as they age" stuff. Not to say you ever said that, but I know some others here that have.