Well I will roll a dice. We have one stud colt, he is well bred (hall of fame stud father), half-brother aimed at Hamiltonian (not out of one of our mares, sadly). The plans are to see how he matures and if he is any good keep him as a stud. Being any good means he needs to be a racehorse and a good racehorse. His older brother has lots of potential but not enough potential to remain a stud. The real deciding factor for his gelding was that he was getting fresh with the trainer. So for the stud colt to keep the family jewels he needs to be nice, he needs to be fast, he needs to stay sound and he needs to make money. If he does not do all four of those things he will be gelded. Than depending on how many other of those things he does not do he will be gelded and turned into a pleasure horse, or gelded and remain a racehorse.
I don't have a stallion, and very likely never will, but my barn owner has a stallion, so I'll use him
Lux (Luxembourg Horse Pedigree) has an A+ temperament, great conformation, fantastic breeding and a very promising career on the track, cut short due to severe injury. He is not yet well proven as a breeding stallion, but his first foal is a purebred filly that has four white stockings and a blaze, out of a solid colored mare, and is very correct and headed for the track when old enough. The career ending injury was a severe sessamoid fracture, not conformation related.
His foal crop is much anticipated for next year, 4 foals out of eventing mares(foals will be groomed as eventers as well), three foals bred for the track, one for endurance and one foal bred as a pleasure/speed event foal. He has universal appeal, with a gorgeous, traditional head, nice size and build and loads of charm and charisma.
If, for some reason he does not produce the quality of foals expected, he will no longer be allowed to keep his "jewels".