I think it's funny that there's so much talk of imbalance, when a similar thing happened in the '80s—in that entire decade, the Western Conference had only two representatives in the Finals: the Lakers and the Rockets—and no one seemed to care.
These things have ebbs and flows, and things always shift eventually—"on their own," so to speak. It seems to me, for example, that over the next couple of seasons, free agents from Western teams will see the relative weakness of the East and decide that the East offers a better path to success.
to be fair on the Celtics, Sixers, and Pistons made the Finals from the East in the 80's also.
These were the finals
80 - Lakers over Sixers
81 - Celtics over Rockets
82 - Lakers over Sixers
83 - Sixers over Lakers
84 - Celtics over Lakers
85 - Lakers over Celtics
86 - Celtics over Rockets
87 - Lakers over Celtics
88 - Lakers over Pistons
89 - Pistons over Lakers
The Pistons beat the Blazers in the 90 Finals and then began Chicago's dominance.
So from the 1980 Finals through the 1993 Finals, the East had exactly 4 teams win the conference and they were all basically in spurts. Sixers 3 of the first 4 (C's the other), then the C's 4 straight times, followed by 3 straight by the Pistons, and then the Bulls first 3-peat. The West obviously wasn't much different as after the Blazers in 90, it went Lakers again, then Blazers again before the Suns in 93, then the Rockets twice more, Sonics, and the Jazz twice, leading into the Spurs and Lakers dominance of the late 90's early 00's.
The League has always been about dominance at the top, what makes the league different right now is the shear volume of better teams in the West then the East. That really hasn't happened at any time in the sport as historically each conference has had a dominant team, a couple other great teams, and then a handful of good teams. Right now that just isn't really the case. The West has significantly more top level teams and good teams. If you moved 4 of the 12 good teams in the West to the East, at least 3 of them would be heavily favored to make the playoffs. I think that is the real problem. Now as I've said in 3 years, I think the East will swing back around since most of those teams in the West have older stars and there are far more younger elite level talents in the East right now, but then again those players might not develop or might venture West as well.