I 100% agree that at least for now, all carriers should be removed from breeding until more is known about the disease. Clearly this is a connective tissue disease, and nobody knows yet whether hetero/carrier horses are at a higher risk of complications as they age.
I don’t see how that is punishing Hilltop - they’ve already stated he’s removed from breeding until more is known.
IMHO, a high profile operation coming out with this may easily be the catalyst for MOs to test their mares, and for many SOs to test so they can lay claim to clear stallions. SOs who find a positive stallion may or may not make that known.
Hilltop may be the catalyst for having registries start requiring testing, just as AQHA requires 5-panel testing for breeding stallions who breed more than 25 mares (why not any mare, and why not the mares as well, I don’t know).