There are so many things that were just theories in that we thought we could not attain, and now here we are,curing diseases, flying in the skies, now I hear there is a cure for cancer and AIDS. That which has been proven difficult to attain, humans have in times without numbers has beaten all odds.
So would not be surprise to hear that 100% human immortality is possible. By the curing of disease is kind of prolonging human life which I can term as partial human immortality.
Although it will take decades to attain this, but once this is discovered, it will be very expensive for many.
I guess I wrongly imagine that human immortality means that all humans with live forever. I suppose that for human immortality to be a reality, it would just take one person to live forever. I still don't think it's very likely any time soon. On one hand, people are resilient, but on the other hand we are quite fragile. People die just from tripping on the sidewalk and hitting their head. People will always die. I think that we'll continue to keep living longer, on average, but we'll still be dying.