Lakers having a "bad night" is not really an excuse anymore. They are just having a bad season, they are not built properly and the team doesn't gel together very well. All they have to do now is wait for the season to end because this season will not be anything special for them at all. This means after the season ends they will have a chance to get better eventually.
It already came to a point where seeing the Lakers playing like this a common thing already because... they are playing like this the whole season. Lebron is busy carrying the team while other players are just playing without any sense or urgency or they aren't that competitive anymore.Lets just wait for this season to end and lets not expect that the Lakers will at least enter the 2nd round at least because we might see a miracle especially when we see Davis playing the whole playoffs.
I think Golden State will grab another championship, Suns is good actually but I think there is something missing in there team. Lakers will surely not win another championship knowing that the team composition is not that good, also AD is injured and LeBron do all the lifting, Westbrook does not fit in their team, Caruso is the better point guard. I think Bucks vs Golden State in the finals. But let see if Suns will not choke.
I'm a Warrior fan so I will agree with what you said that they will get a championship. 
.On the other hand though, I don't like disregarding other strong teams especially the Suns because they are the top seeded team right now and they almost got a ring if only they have a substitute for Ayton at that time to defend the paint. Another team that must be added into the list is the Brooklyn Nets. With Kyrie, KD and Ben Simmons playing at the same time, we know how deadly this team are. With a complete roster and no injuries, we might see them in the NBA Finals. Lakers? Nahh lets stop talking with them now and lets just wait for their move in the off-season.