Bitcoin has replaced the dollar for me.
How? Do you not use dollars at all anymore? I don't think its currently easy to exist solely on bitcoins right now.
Does it matter that idiots will continue to use fiat? Some people still have landline phones.
I don't think it makes people idiots. I would love to use exclusively bitcoin but it's just not possible for me to do so currently, and paper money is still useful for certain transactions. I still have landline as well as a mobile and skype etc mainly because it's cheaper to use than a mobile and costs very little to have with my internet package so I still use that when at home.