As I see it, there is a long term quandary at play here. When you establish a zero tolerance/no compromise hard-liner policy (blanket placement of NMV signs on all small roads) that is hostile towards the established local community and then mix in spotty and inconsistent enforcement (SPP), you enter a dangerous social realm. Over time, this will easily result in a shift in attitude toward marginalizing rule of law in State Parks, which is much the opposite of the intention. If the SPP, Forestry, Fire, etc. are not on-board with or feel left out of this policy change, the effect is magnified. Furthermore, I would say it is highly likely that hunters and hunting clubs will stick to their traditional patterns this fall/winter and ignore all signs this fall en mass... many of their tree-stand locations and drives are based on years or even decades of successful hunts. They don't have the time or motivation to change.
Some of the tracks in smoke_jumpers picture MAY be the outlaws and low-lifes that are commonly credited with exploiting areas like 1/4 mile. However, as it stands to reason, a relevant and significant percentage of those tracks were likely left by other-wise law abiding citizens on a trail ride they have taken regularly for years... people that want nothing to do with 1/4 mile and such hot spots. In these cases, you're probably talking about groups of locals or regulars that are faced with an unfair choice. A choice that their friends, family, and even children might be actively taking part in.
When any policy results in regularly law abiding citizens feeling they are rightfully empowered in acts of civil disobedience... social relationships and government leadership heads into a dangerous death spiral.
I'm NOT encouraging or supporting any individual actions. I have yet to drive around any of these signs, I haven't yet had a reason to. I am merely pointing out the dangerous and potential hazardous side-effects of such sloppy policy.