But who is going to make that decision?However, the definition of "human" might be broadened to match
No doubt. The only reason our ancient ancestors are not called "humans" is because they weren't smart enough to name themselves. Even if we continue to evolve, we will likely still call ourselves "human."
The question really becomes: at what point do humans stop being homo sapiens? Will we recognize it about ourselves? Or are we more or less going to remain this form forever?
Well, create a fixed definition homo sapiens, and if/when we fail to meet that definition, call us something else.
I'm picturing a random group of scientists sitting in a room, and one guy blurts out, "Uh...guys...I don't think we're homo sapiens anymore."
It's weird to consider.