Digital dollar will be a joke. If it is like the dollar and central bank can issue from the thin air, what's the point? The bitcoin, like gold, preserves its value and will become even more valuable, because the supply is limited, that is all the differences.
The point is to eliminate cash. That's what they want since the beginning. They don't want you to have any physical notes because that threatens the banking system. Physical notes are hard to trace and you can't know who has how much. When everything gets digitalised, both of these problems will be gone.
The only problem is there are still many old people that can't use any electronic devices and I guess covid19 is here to fix that.