I saw the posts in tweets, and decided to turn it into it's own thread instead of dragging tweets out further over the matter.
Anyone who's talked to me about it knows I hate this area and the concept behind it, along with the basis for how it works. I think there's two things that can be done to make the whole thing a lot more acceptable, though.
1. Make killing zombies in the Waste Facility dramatically reduce the spawn rate of the Highway zombies.
I think it is safe to say that most people who do the quest do it to have more things to bash/make more gold. These people tend to go only into the Waste Facility. Why? Probably because fewer people have access to it, and there are fewer that can handle the additional mobs alone. It doesn't make sense to cut them down at the source only to have more appear mysteriously on the roads. This would also provide some incentive for clearing out the highways before the Facility, instead of vice-versa.
2. Reduce the amount of gold carried/generated by zombies in the Facility proper. Let it remain the same for zombies outside of the facility.
This one is bound to be a lot less popular, but I feel like the Facility as a whole adds a lot of extra gold to the game, which makes it into a rather select number of hands. I think that, at the least, zombies that have made it onto the highways -should- have more gold, because they've had time to go marauding about the countryside and such. Zombies that have been stuffed away in trash for centuries should not.
The quest currently gives incentives for inconveniencing other people. I think these two things would at least give incentive on keeping the highways cleared first, which is generally better for everyone on the whole instead of the people with enough DMP or the right damage types in their attacks.