Why we'll never see another 30 game winner

Two years ago, many people were saying that Ubaldo Jimenez had a shot at winning 30 games. Looking back on it, this claim was implausible on so many different levels. People who didn't like Ubaldo's chances cited the declining number of IP/GS as a reason why this wasn't possible. However, even that does not actually explain why. The real reason is the decline in the number of starts in a season. Taking a look through the yearly leaderboards reveals that there hasn't been a pitcher to reach 36 starts since 2003, a 37 GS pitcher since 1991, and a 40 GS since 1987. Based on that logic, we would assume that a modern league leader would get 35 starts. In order to win 30 games in 35 starts, one would require a W/S% (win/start %) of .857. According to baseballbypositions.com, the last pitcher with a W/S% that high was Lefty Grove in 1931 (incidentally the second-to-last 30-win season). To put some more perspective on this, let's take a look at the most recent 25-game winnners (since 1969) and their number of games started: