You sir clearly don't understand what Bitcoin is. You are correct about the dollar but bitcoin doesn't need to be backed by anything, it just needs to be adopted. And a currency that is decentalized, borderless, and a peer to peer payment system well you can be sure that will get adopted quick.
Yeah you should know from the start, that bitcoin is not backed up by anything, there is no government support, developed economies, or the state. it's a challange for bitcoin itself, and the proof is that bitcoin is a respected currency with its innovation, bitcoin is the world's most expensive currency right now!