I actually think that being bilingual in sign and any spoken language is more valuable than having two spoken languages. There is a greater likelihood of me being able to communicate english with a spaniard verbally as opposed to communicating orally with a totally deaf person who only signs.
I think signing is becoming viewed as "cool" much more than in the past. The baby signing classes that have sprouted up are probably part of the reason.
On the other hand, you know why many hearing people view sign language as a disability crutch. It's because the majority of people don't use sign, at least a good many of hearing people view being deaf as a disability at least to some degree, and many would compare the use of sign to "speak" to the amputee using a wheelchair to "walk", or the blind person using a dog to "see", both of which have been labeled "disabled persons". That's just the way many people see it at this time, right or wrong.
By the way, I don't want anyone feeling sorry for my son because he's deaf, and I certainly am not going to promote the idea that he is "disabled". While many would consider deafness a disability, out of all the "disabilities" one could work through in thier life, being deaf would be the one you'd want (for me at least). You're just like any other person, without the ability to hear (to varying degrees). Physically, mentally, emotionally, and spiritually you are like any other person - and there's a lot to be thankful for right there, and an open road in front of you.