I think some governments are going to try that idea as a way to not let their citizens use actual bitcoin. But I think using that kind of money defeats the purpose of Bitcoin. The point of it being digital is that we can use the token itself without having a derivative of it.
Any time you have a money that's "backed", it's just a Pathway for it be debased, and more relevantly, have Riba be embedded in its operation. We saw this happen with gold.