They can listen in certain instances, but overall, fans aren't the professionals. We don't know what the main idea is of the writers. If they listen to us after the fact, it leads to lazy, meandering writing. They can't listen to us before because there would probably be no fan-base for something that doesn't exist yet.
A a fan considers as something that may need to be fixed, doesn't necessarily line up with what the writers or network think. So overall, I don't think this is a good idea. I think it is okay for writers to have fan nods or moments made for the fans, but they shouldn't base their show to be purely for the fans. It also narrows the scope for new fans. Being highly particular will push many out who aren't as big of a fan, or are casuals.