It might be impossible to make significant change without making some group worse off. My point is the net cost of BI is simply the added benifits to very low income people as long as your also removing other subsidies. And we are already handing out a lot of subsidies.

Which subsides to remove becomes an open question. EX: With BI do we still pay post doc's a small amount for living expences?

PS: If nothing else BI is an interesting comparison point for the current system. EX: You get more from SS as a married couple than an unmarried couple.