I agree it is a bit of a crapshoot, but I feel that if landowners who own a 40 acre chunk here or there, or a quarter here and a quarter down the road a mile aren't doing the minute amount of work require to post their land now, odds are they don't give to squats about people hunting on their land, so even if they did for some reason decide to go yellow or red on the database map, if contacted they would probably let people on to hunt as long as the hunters are respectful...
The more I think about this, the more I begin to lean towards this being a pretty decent compromise for all parties involved. Landowners don't have to spend money and time to post their land if they don't want people hunting. If other landowners could give two shits less and don't want to be bothered, they leave it green and let people have access without being contacted... It gives landowners a choice on whether or not to post their land, makes it easier if they choose to post, and it also provides a resource for hunters to make it easier to obtain contact information for land that is huntable but posted...