I don't think you're seeing the point of the argument. Whether or not one side is more scare than the other isn't really that relevant because you're going to have injuries and that's going to adjust from time to time. The point in dabs saying the runs are way down is when you consider relative to where we were less than 10 years ago.
http://www.baseball-reference.com/leagues/MLB/bat.shtml
We currently sit at 4.07 runs per game down from the 2000 peak of 5.14 with a steady decline from 4.86 in 2006. That's pretty significant. 15 years ago roughly you're talking about scoring 26% more runs per game on average and then taking that times two for each team.
As to your initial question, it doesn't really work that way because how do you classify #1 starter? Was Matt Garza a #1 stater with the cubs? If by pitching first in the rotation then yes but I don't think we should ever have considered him "a #1." As such, I don't know any place that tracks such a thing because from a statistical standpoint it's kind of a meaningless term. If you want that sort of information stats people would say just look at individual pitchers.
A better way to do what you're looking to do would probably to look at qualified pitchers and sort based on ERA for two time periods of several years. While that wont give you a team by team example, it will show you how many pitchers are below a certain level. So, if here's 50 sub 3 pitchers now vs say 25 in 2000 you can see the overall difference.
All that being said, I think it's kind of a fruitless endevaour. Whether or not hitters are better or worse than they used to be really only matters so far as scoring runs and it's pretty plain to see that runs have dropped off a cliff. This season is tied for 27th lowest on record. And what that does even if there are fewer Kershaws in the world is makes the separation between good and great less. I mean most don't consider Hendricks an amazing pitcher but at a 2.46 ERA he sure "feels" like one. Especially after we're used to seeing 3.50 ERA being considered edge of "elite" during the steroid era. The average MLB starter this season has a 3.83 ERA. There are 20 starters under 3 this year with qualified innings. In 2000, the average starter had a 4.87 ERA with the the top 20 starters in ERA being between 1.74 and 3.91 compared to 1.77-2.98 this year. In other words, the "elite" range has shrunk from 2.2ish runs to 1.3 in terms of difference. The difference this season between the 20th best era(2.98) and the 50th(3.66) is 0.68 of a run.
Now, you can argue that hitting has declined too so relatively it may be in a similar state but what that smaller difference does is mean that if you have a good hitter his one RBI matters more. One run in the steroid era might not make up the difference between a good and a great pitcher but now it roughly does.