When I finished making my post, I said to msyelf "I wonder how long till somebody starts commenting that CI's are supposed to make children hear just like normal people" - I see I can judge the posters here all too well.
Language acquisition doesn't happen on its own. Think of your own children - if you never spoke to them, never interacted with them, never taught them new words etc they wouldn't just automatically start speaking on their own would they? I have a niece and nephew (ages 1 1/2 and 3) and I am always talking to them and teaching them new words. You don't just implant a child and expect it to be a magic wand that automatically solves everything - haven't you read the posts of other parents of implanted children here and how they have detailed the WORK they have put into helping their implanted children? *sigh*
What I AM saying, is that if you implant a child and expect them to LEARN English - they better be in an environment where English is supported. An implanted child born into a spanish-speaking family will learn to speak spanish - the parents/siblings/friends will interact with the child and teach them new words, and they'll pick up the language that way. Then when the child is old enough for school, they'll be treating English like a second language. In order for them to learn English fluently they need to be in an environment where it is used regularly, every day. Now if the family uses BOTH languages equally I can see no problem with that. For example, I believe Cloggy's family speaks 4 languages, and Lotte is learning two at the same time - but that's with family interaction and involement, teaching her new words and showing her how proper sentence structure is etc. If Cloggy and his family only spoke Norweigan, its very doubtful that Lotte would just automatically pick up English because some people she happened to hear while out shopping or whatever spoke that language. See what I'm saying?