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.
Actually, I think its the other way around. You'd have to be an idiot to be all in on BTC, unless you don't have much wealth to protect. It is slow, with no protections, no financial legislation protecting you from uninsured asshats running away with your money, and it is volatile.