Of course Harada isn't going to say much, but a good time to have released TxSF would have been 2013 while the crossover idea was still relevant. Or hell, now's a good time with the amount of people who won't be able to play Tekken 7, and with nothing else dropping to console.
I don't know how this game is far in development with 0 to show, 0 leaks, nothing to show at your own panel, no other fighting games being released to console, and while development effort being is put into Tekken 7, Pokken, and Rise of Incarnates. Plus why would it be far in development without a release window?
Namco probably saw how cheeks SFxT was after all its buildup, and put TxSF far off on the back burner to work on other things. If TxSF isn't vaporware, then they'll probably put forth the actual development effort after they're done with T7 and Pokken and drop it in 2017, because SFV is going to have the market's attention for 2016.