We have not learned everything about human body. We get closer and closer to unlock what our body can do. Our human body is limited on what it can do by nature. That hasn't stopped science. We continue to learn new way to ward of disease. We continue to learn how strong we can really get so yes human can unlock rapid cell regeneration.
I can do this power slowly indeed you can heal slowly for example you are cutting your finger part it is not re grow but you try for healing and two days later your finger part can heal that it everyone can do this ability with techniques ok just techniques
Yes, everyone wants to be like wolverine here, but no, that won't happen.
Yes, curing diseases is one thing, but being able to have rapid cell regeneration, is another. It's just a stupid idea. We won't be able to grow superpowers out of science, is what I'm saying. (In a dumbed down way of course.)