I don't think so. The only major cities in Oregon are Medford, Roseburg, and Grants Pass, (or Klamath Falls) all under 100,000. The route isn't suitable for any sort of fast running, being very steep and curvy.
Is there rider potential between Eugene and Sacramento to justify more frequent service?
No, and the troubles with the border have been resolved.
Since the "Cascades" are funded in part by the states of Washington and Oregon, any southern extension beyond Eugene is highly unlikely.
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