I didn't talk about individual/isolated matches, but the long run. Dortmund on their day could still beat Bayern (and most other teams) today, but not keep up with them over the course of a full season because they lack the depth that Bayern have. Especially for Dortmund with their high-tempo exhausting style, they need depth to avoid inconsistent performance due to fatigue.
Look, Dortmund won the 2012 season with 81 points. Last year, Bayern won the title with 91 points, and if they continue at their current rate, they will get around 93 points or more this season. Dortmund would need to perform significantly better than they did in 2012 to beat Bayern to the title. I wasn't downgrading Dortmund's achievements, far from it, I like Dortmund a lot, I'm just saying that this gloomy mood around BVB is uncalled for since they didn't significantly deterioriate. The difference is that Bayern significantly improved.
Klopp-Dortmund have been and still are very strong, but they need to evolve (financially and depth-wise) to be able to keep up with Bayern over the course of a full season. Which, as I said, I think they are working on with consistent CL qualification and minimal spending. Losing Götze and Lewandowski to Bayern is a blow, of course, but then they've always lost player and managed to get out of it and, as I said, losing your best players is a fate you simply will have to endure on your way to becoming a top, top club - just look at Arsenal and their situation in 2010 and now in 2013/4. (By which I'm not defending Bayern/Hoeness and their raiding)
Now,that's a different thing and there i agree with you.Of course a team like Bayern that has 20 players that could be starters and buys 2 world class players every year,will be better in a season long competition like the Bundesliga.
But Dortmund in 2011/12 was just as dominant as Bayern was last year...the difference in points total was due to the awful start Dortmund had in the beginning of the season when Gundogan wasn't acclimatized to the team and struggled to replace Sahin.They went out of the champions league and had 3 losses and 1 draw in the first 6 games in the bundesliga.Like i've said,sure Bayern had more points last year,but they didn't beat Dortmund yet BVB beat them 4 times in the 2010/11-2011/12 seasons when they won the bundes + the cup final.
The trouble with Dortmund is that every year they sell an incredibly important player and each season they have to re-adjust their style,passing,etc because they don't buy the same players as replacements...it happened with Sahin/Gundogan,last year with Kagawa/Reus and this again with Goetze/Miki.
Imagine Barca in selling Xavi in 2009,then Iniesta in 2010 and finally Messi/Puyol to Real.
Had players like Kagawa been more thoughtful,BVB would have been a top 3 team in Europe for a decade...everyone was young,amazing chemistry,great defensively,offensively you name it.
Piszczek/Hummels/Subotic/Schmelzer/Gundogan/Bender/Kagawa/Reus/Goetze/Lewandovski?
As good a squad and complete a starting 11 as you can have.
But it is what it is,until there's some kind of a salary cap like in the NBA,teams like Bayern,Real,Barca.City can spend any amount of money they want and teams like Valencia,BVB and Arsenal will only serve as incubators for those clubs.