Why Gamble?

My question is... how do we ensure that EVERY Deaf child will acquire language at the same pace as hearing children? Why hold back ASL when spoken language is not 100% accessible for all Deaf children? Choosing the English-only route is a gamble... maybe the child will develop speaking and listening skills... maybe not. If not, the child will be delayed in his or her language and cognitive development. If ASL guarantees 100% access to language from birth, and guarantees fluency in both languages, why take the risk with the English-only route?