I would absolutely make this trade!
Romo is alot better than Hass, Welker is great in PPR but so was TJ (and should still be considering the strong preseason)!! and then you get Hixon for free which could replace one of the horrible guys you have on your bench!
Do it now!
Good Job and Good Luck!
Standard H2H 12 Team 1 Pt PPR, Start 1QB, 2RB, 2WR, 1 FLEX (RB/WR/TE), 1TE, 1K, 1 DEF