At least there is discussion. www.drf.com/news/jockey-club-eyes-limiting-stallions-books-140-mares?type= “It’s one of those things that will definitely change how folks go about their business,” said Mark Toothaker, the sales manager at Spendthrift Farm, which stands five stallions that covered 140 mares or more in 2018, including Into Mischief, who led all stallions with 245 mares bred. “This will change everything.” Hooper
Limiting the number of covers by perceived top stallions will raise the breeding fees on those horses... driving the market to less highly-regarded stallions. This new rule will definitely increase the diversity of the gene pool. Seems like a good idea to me.