Drugs like Genentech's Herceptin show what biotech can do when it comes to innovating blockbuster treatments, says Robert Langreth on the Forbes Treatments blog. Indeed by 2014, analysts predict that the top five bestselling drugs will have come from biotech. The problem is, no one wants to pay for the next generation of treatments, like those derived from stem cells, that could be hitting the market around 2020, Langreth says.