In 2014 SpaceX has 12 launches scheduled. In 2015 they have 14 scheduled. They even have launches scheduled as far ahead as 2018. They started development on the Falcon 9 after NASA had started working on the Ares V (which grew directly into the SLS), yet started flying in only five years. By the time the first SLS is launched, the Falcon 9 will be roughly on launch number 75, and the SLS is never even projected to deliver more tons per year to orbit that the Falcon 9 is scheduled to deliver in 2014.