I do not believe we will ever be free of the tadpole.
The powers granted from it, are like source powers form Divinity. I think that it will always be a part of us.
I think we are part of the adversary, and we have undergone complete ceromorphosis, we just don't look like Mind Flayers, and are not connected to, the elder brain.
Tadpole usage is optional. If you never use them, you do not get the dreams or any of their associated powers. They aren't like Divinity's source powers.
The devs have warned players about using them too and a negative side effect has been datamined.
