SM4 also installed two new observation instruments--Wide Field Camera 3 (WTF3) and the Cosmic Origins Spectrograph(COS)--and the Soft Capture and Rendezvous System, which will enable the future rendezvous, capture, and safe disposal of Hubble by either a crewed or robotic mission.. 
This is no longer possible since the space shuttle Fleet has been reTired, and would have been unlikely in any case due to the cost of the mission and risk to the crew.. 