I don't know if I agree with that. We're still in a playoff spot even if we don't have Romano all season.
Our top 5 options (Romano, Garcia, Mayza, Cimber, and Phelps) all have an ERA under 3 and peripherals that generally support those numbers.
I'll never argue against another late inning addition, but these guys are quite good and haven't been a problem this season.
The problem is the rest of the bullpen, the middle innings. Richards, Merryweather, Thornton, Romo, Borucki, Vasquez, Lawrence. They aren't getting the job done.
Maybe you get a late inning guy and bump someone like Phelps down to this role, but a couple of depth additions would be huge for this team, even in the absence of a big ticket reliever.