Read/write DNA?

Stewart Church has a vision. Not only does he want to read vast quantities of DNA using cheap testing methodologies, he wants to edit DNA in vivo and in vitro. To step into the DNA polymer and make it dance to our tune. To treat genetic disorders. To treat cancers, heart disease, inflammatory disease. To turn cells into therapeutic vehicles. Here's a link to the BBC article. This is the future. It may take a while coming, but it'll get here. The NEW New Genetics.