They are in finals now. Even without Kevin Durant, I think they are taking down whoever comes from the East (Milwaukee or Toronto). Steph is back to 2015 MVP level, Draymond has been fantastic and Klay is also chipping in.
Not only possible but they can definitely do this, remember they already won championships even without Kevin Durant, they have a lot of good players that can be a good substitute to Durant, I expect Warriors to win the series 4 - 2 Raptors are a great team but Warriors are talent-laden and they have a lot of experience playing in the finals.