In an answer from a question from Mark Matthews of the Orlando Sentinel about the future of the space shuttle-

OBAMA: First of all, we have authorized were budgeted for additional shuttle launches that had not been scheduled. So we’re extending the life of the shuttle because a) I think it is doing some important work and b) we are very mindful of the economic impact of the space program in the region.

It is unclear how many more shuttle mission over and for how long the President intends to keep flying the shuttle. It may not be possible to extend shuttle flights for much longer than planned.