Not to diminish your first year achievements but these case log minimums are exactly that, bare minimum requirements, not overall volume requirements for the program. It is a more serious requirement that the program has to have 7,000 cases per resident, per year. (i.e. a program with 10 residents/year * 4 years would need a volume of 280,000 per year).
https://www.acgme.org/acgmeweb/Port...FAQ-PIF/420_diagnostic_radiology_07012013.pdf
This is a really difficult issue simply because there is a lag of at least 5 years before any change affects the market. You might say, "Well, it's better to have a shortage of radiologists than an oversupply." There are situations where that can backfire majorly. For instance, if a serious backlog for imaging develops, it will encourage other specialties to steal it. Imagine if wait time for lung cancer screening chest CTs became excessive, then there becomes an incentive for pulmonologists to start reading them. Hell, they might even create their own sub-sub-specialty just to do it (call it screening pulmonology). Don't think it can happen? Think again. Other specialties are envious of your job and your money, and will do what they can to try to get it.
At the current time, the supply of radiologists probably ranges from a few too many to just enough. There is probably no way to accurately make a fine adjustment because of the delay involved.