Personally, I wish everyone would bag in the blue bags. The bags are bio-degradable. The fecal matter breaks down in approximately one year's time. That's good in a controlled waste management environment.
The problem arises when you deposit the blue bag into a plastic-lined container. What you've essentially done is assure years from now, sometime in the far future..., the archaeologists will come across these filled blue bags . Based on their research, they'll ponder long and deep as to whether the people of the early 21st century greatly valued their dog's poop.
The moral of the story - if you're going to blue bag, make sure it's placed between the plastic liners and the side of the trashcan. That way, it'll go to the dump and not be counted as treasure trash generations from now.