If the Blazers' recent play is them bringing it all together and not just a hot streak -- and I don't think it is just a hot streak, as they've changed some things in their approach and even won when missing shots they usually make (something that would get them blown out earlier in the year) -- I think it's very reasonable to think they can win three of the last four.
My gut feeling is that the Mavs and Lakers each lose two. Dallas, IMO, has been outperforming its talent by a wide margin in the last month or so. An off game for Doncic is doomsday for them. I could see any or all of those middle games being losses. The Lakers aren't healthy and won't be healthy, and they've been trying to fit new pieces in without key pieces to chemistry with them. I think Drummond was a case of subtraction by addition, because he makes all of them have to work harder on the defensive end and he forces AD out of the post if they try to play them together on offense ... and playing AD outside diminishes his effectiveness in addition to changing the whole dynamic of how and where LeBron plays.
Obviously, the Lakers can repeat because they have the best player in the game, but they also have a number of weaknesses that could stop them in their tracks very early.