It's an all around stupid idea. The reality of the situation is that both types of bags present ecological problems, recycling is a joke as most recycled goods take more energy than fresh harvest and creation, and most of the stuff you turn in for recyling winds up at the dump anyway. It's a law based on false assumptions to fix a crisis that doesn't exist and will do nothing more than add costs. Two of the reasons businesses like plastic bags is they condense better and are lighter, being able to ship more units in the same space and weight saves on shipping costs and fuel usage.
Paper is still better.