Oregon Representative John Lively (D-Springfield) has introduced HB 3166. It would set up a top-five primary, and abolish the ability of parties to have nominees. However, there is no provision for Ranked Choice Voting in the bill.
Thus, a primary might conceivably have four Democrats and one Republican placing in the top five. Then the general election would be obviously unfair to the Democratic Party, because the Democratic vote would be split up and the sole Republican would be extremely likely to win, even in a heavily Democratic district.