You did not explain how this actually raises maintenance costs for bridge or roads. You just make the assertion. One of the major things  you gloss over is that wildlife does not always deal well with intrusion.  The present agreement was worked out in concert with 10 states. 

How does this agreement increase maintenance costs? Which wildlife is thriving? Coyotes - yep. deer - likely. To claim that these birds will be just fine is not born out. The environmental needs are not just where adult birds can live. If you bother to look, you will learn that it's a lot more than acres available. Habitat fragmentation and invasive species for example  are important factors the present agreement considers. This was not some "Hey - let's do this" thing. People who actually know what they are talking about worked together with state governments to arrive at a decent plan.

No projection, just facts.