Both Rajdhani run quite empty these days , evident from 200+ current availability. But Talgo in its current form will take years to be obtained, TOT, reframed internally to suit 3A,2A styles,etc. So quite a long time to go before it is put to operations. Also needed to keep fares of Talgo and Rajdhani in same range or will have another disastrous eg similar to Gatiman and BPL Shatabdi.