Shuttles Can't Finish Space Station

Doug Dante writes "The shuttle can't make the 28 flights now planned before it retires in 2010, according to Dr. Michael D. Griffin, the new administrator of NASA. It can only do about 15-23, leaving 5-13 planned missions to alternate lift vehicles. NASA is expected to consult space station partners on alternatives once they are approved by the Bush administration. Should the Space Shuttle be cut loose?"