Is the Old Adage: Defense Wins Championships Still True?

We have all heard it before, defense wins championships, however do the number back this up.

The main statistic I used to judge this is the use of offensive and defensive rating which is defined

Offensive Rating = (points produced / possessions) x 100 or basically how many points a team produces per 100 possessions. 

Defensive Rating = (points allowed / possession) x 100 or basically how many points a team allows per 100 possessions. 

The reason for using these two statistic is that it help show efficiency.

For example, the Warriors were ranked #2 in offensive last year averaging 108.8 ppg however, there offensive rating is ranked 14th in the league. The reason being is that while they do score a lot of points, they also take more shots than other teams making them less efficient.

In contrast, Portland, who was ranked 21st in the league with 98.1 ppg, is ranked 7th in offensive rating making them a more efficient scoring team then the Warriors despite averaging few points.

Offensive and Defensive ratings helps ignore the fact that teams play at different paces and take different amounts of shots which makes it a more ideal statistic to use.

Below is a chart of the past champions and where they rank in off. and def. rating. 

Year	Team	Off. Rating	Off. Rank	Def. Rating	Def. Rank
2009-2010	LAL	108.8	11th	103.7	4th
2008-2009	LAL	112.8	3rd	104.7	6th
2007-2008	BOS	110.2	10th	98.9	1st
2006-2007	SA	109.2	5th	99.9	2nd
2005-2006	MIA	108.7	7th	104.5	9th
2004-2005	SA	107.5	8th	98.8	1st
2003-2004	DET	102	18th	95.4	2nd
2002-2003	SA	105.6	7th	99.7	3rd
2001-2002	LAL	109.4	2nd	101.7	7th
2000-2001	LAL	108.4	2nd	104.8	21st
1999-2000	LAL	107.3	5th	98.2	1st
1998-1999	SA	104	11th	95	1st
1997-1998	CHI	107.7	9th	99.8	3rd
1996-1997	CHI	114.4	1st	102.4	4th
1995-1996	CHI	115.2	1st	101.8	1st
1994-1995	HOU	109.7	7th	107.4	12th
1993-1994	HOU	105.9	15th	101.4	2nd
1992-1993	CHI	112.9	2nd	106.1	7th
1991-1992	CHI	115.5	1st	104.5	4th

As you can see there is slightly more variation in the off. rating of teams then there is for def. rating. In addition, aside from the 94-95 HOU and 00-01 LAL, there is no championship team that ranks outside the top 10 in defense rating while there are 5 teams ranked outside top 10 for off. rating.

However, will this trend continue?

The average team points per game for the league has been slowly going up every year, from a league average of 93.4 in 03-04 to 100.4 last season. 

While the old adage "Defense wins championships" still seems true today, will it still hold it's ground in the future?