The path to financial freedom comes first we need to get rid of the debt based economy so the real way Will be USDT backed by digital gold the btc and other digital currencies.
USDT cannot be backed by Bitcoin or it losses the status of being a stable coin. It will also be unnecessary to use a coin which is backed by Bitcoin when you can simply buy Bitcoin.
As it is, Bitcoin cannot effectively replace fiat globally just yet and any country who wants to adopt it will be using it as an alternative currency and not the staple one.
USDT is best money out there right now because they backing up with btc reserves.
You can't at any point in time vouch for the status of the reserves and it's mostly a game of trusting a centralized system.