NASA, ESA, RFSA - capabilities..?

Why don't NASA, ESA and RFSA team up and build something together that would replace the space shuttle? Maybe from Buran or something entirely new? Isn't it time to make an aerodynamic vessel capable of normal take off and space exploration? If we have Iphone, Ipod, F-22, scramjet engine, YAL 1 etc., why couldn't we build something that would be using anti-mater propulsion and could travel near to light speed? Why is everyone so inert?