As others have pointed out, total wins is a net constant. This is simply a case of the rich getting richer. The top two teams in the league combined for 140 wins, that's by far, a record and the both happened to be in the Western Conference. And, that means fewer wins for everybody else. This is actually a continuation of a recent trend (the rich getting richer in the Western Conference). Here's a look at the total combined wins for the top 2 teams in the Western Conference over the past few seasons (not including the lockout shortened 2011-12 season):
2009-10:
1st Seed - LAL = 57 Wins
2nd Seed - DAL = 55 Wins
Combined Wins = 112 Wins
2011-10:
1st Seed - SAS = 61 Wins
2nd Seed - LAL = 57 Wins
Combined Wins = 118 Wins
2012-13:
1st Seed - OKC = 60 Wins
2nd Seed - SAS = 58 Wins
Combined Wins = 118 Wins
2013-14:
1st Seed - OKC = 62 Wins
2nd Seed - SAS = 59 Wins
Combined Wins = 121 Wins
2014-15:
1st Seed - GSW = 67 Wins
2nd Seed - HOU = 56 Wins
Combined Wins = 123 Wins
2015-16:
1st Seed - GSW = 73 Wins
2nd Seed - SAS = 67 Wins
Combined Wins = 140 Wins
The West hasn't gotten weaker, just more top heavy. The top two teams in the West were ridiculously good this year. So, of course, that means fewer wins to go around for everyone else. In other words, the Western Conference has been moving away from parity for the last several seasons. Back in 2009-10, 8th seed OKC won 50 games, compared to 8th seed HOU's 41 wins this year. Again more wins for the top teams means fewer wins for everyone else.
To add further historical perspective, several teams who have won an NBA championship have won fewer than 50 regular season games. In 1994-95, the Houston Rockets won 47 games, were the 6th seed in the West and went on to win the NBA championship. In 1977, the NBA champion Washington Bullets won only 44 regular season games. Their championship still counts and they have the rings and the banner to prove it. Our own 1976-77 Blazers only won 49 regular season games. Talk about parity, that year we upset the top team in the West, the 53-win Lakers, and the top team in the East, the 50-win 76ers.
And, of course, regular season records don't guarantee anything. In 2006-07, the 67-win Dallas Mavericks lost in the first round to the 42-win Golden State Warriors and in 1993-94, the 42-win Denver Nuggets upset the 63-win Seattle Super Sonics.
In the playoffs, it's all about match ups, who's hot and who isn't and who's healthy and who isn't. Yeah, the two examples above are the two biggest upsets in NBA playoff history, but there are other examples of teams with 40-something wins, upsetting teams with 60-something wins. It happens. There are no guarantees, but there are lots of examples of the 5th seeded team upsetting the 4th seeded team. It's actually fairly common. It happened in both conferences last season and we were on the losing end that time around, s we also were in 2008-09. This year, I'm hoping it's our turn to pull off the 5th seed over 4th seed upset. I think we're due.
BNM