Bitcoin not having any backing assets, is not a bug, is a feature.
It means no assets to protect from any evil or corrupted entity.
I agree without this as a "feature" there could essentially be a bit-currency backed by the dollar, ie. the Bitdollar, for use in exactly the same secure, convenient, fast, cheap, online, and semi anonymous way as the Bitcoin, but exchangable for a dollar at your local bank and vice versa... and of course with value controlled by the value of the dollar