You are so right. Someday everyone will have some degree of diabetes. Before 1929 when insulin was was developed, juvenile diabetics did not generally make it to repoductive age. But....how could we do otherwise than provide insulin?
but we can engineer our bodies to fix this.....eventually. cloning and gene splicing, etc...but will we. There are so many moral issues to doing this. I figure it will happen in our far future, but for now it is taboo. (dont get me wrong, I dont propose we do these things.....What is right? I don't know)