Trespass is not necessarily only hunting related, if the trespass occured in relation to something other than hunting, then denying hunting priveleges would be a bit far fetched. There are currently, I believe, 37 states that observe the violators compact or whatever it is called in which those convicted of game law violations in one of the participating states is barred from hunting in the others. If the trespass were to occur during a hunting related incident, then it would be reasonable to not allow that individual to buy a license in those other states. Is Wisconsin a participant? I don't know.

As for places like Montana where, as elkinmtcwb states, there is a lot of unposted land, I would suggest that concerned property owners get off their backsides and do some posting if they are truly concerned with acts of trespass. This does work two ways though in that it would force those property owners to recognise the actual limits of their property and stop trying to keep people off land they should have legitimate access to. I know that there are millions of acres of public land in the west that ranchers use for grazing purposes that they treat as if they owned it, that is not right in my belief. We have similar situations here in Georgia where individuals have bought up the available land around sections of National Forest and then denied access to those wishing to hunt, hike or fish the National forest adjacent to their private property. They have in effect stolen huge tracts of land that they now have sole access to while denying the rest of us access to what rightfully belongs to us.