Beclak, I think this may be the case for some children, yes, but it's very important to consider that this may not be the case for all. Yes, without enough amplification or a CI, spoken language will be inaccessible or difficult to a deaf child and I don't see how you could want to require that child to struggle with it as a primary language. With CIs, however, spoken language is accessible without difficulty, and given that spoken language is more prevalent in the everyday lives of children from hearing parents (the vast majority of deaf children), it is easier to acquire and use for to those children than what they get via weekly ASL lessons and pullouts. The language in general use around a child permeates their lives, making acquisition easier than acquisition of language that's new or entirely unfamiliar to their families, friends, neighbors.
I'm not arguing against ASL -- it's my daughter's primary language, the only one fully accessible to her prior to getting CIs, and it's the core of her learning environment, the school we've chosen to keep her in primarily because we cannot provide enough ASL immersion and stimulation to give her full fluency in the language in a public school or at home with just her parents signing. If we were a Deaf family with a network of signers coming and going, extended family signing on an everyday basis, videophones flashing visual messages rather than cellphones, then this would be reversed, for either a hearing or a deaf child in such an environment.
But I believe that the arguments many put forward about ASL being the more "natural" language for deaf kids from hearing families -- if they have CIs or HAs that provide full access to the spoken voice -- are misguided. And assigning a "better" status to one just plays on emotions.