Judging from the poll going on and plain ol' common sense, the Falmer are a threat to everyone that isn't blind or made out of chitin. But with such a widespread infestation, it will be difficult if not down right impossible to eradicate this threat. However, measures can and should be taken to at least reduce said threat.

Foodstuff Destruction

The American Civil War has taught us that destroying an enemy's ability to feed itself and work its land is crucial to breaking the spirits and war capability of an enemy nation. For the Betrayed this boils down to two things: fungus and Charus. Both will have to be aggressively attacked as vigorously as the nests themselves. While eradicating the Charus may be even more insurmountable a task than the Falmer that depend on them, their numbers can be reduced and thus reduce the Falmer population they support. Egg nests and fungus deposits should be harvested and then sterilized with fire to prevent regrowth.

Visual Aids For Dwemer Security

Being blind hasn't stopped the Falmer from taking over Dwemer holds and defiling their once great cities. I attribute this to the loud, clanking machinery that would be easy for them to avoid. In order to help the ancient defenses, I propose working with Master Calcelmo of Markarth to produce a glowing paint or dye that can be applied to Falmer stuctures, tools, even they themselves that will make it easier for the steam defenders to spot and terminate them. Given the myriad of phosphorescent plants and algae in the cave system, it should not take long for a master alchemist to work out such a substance.

The Frostflow Irregulars

One man might be able to achieve limited results and a Dovahkiin more, but there's only so much one person can do. In honor of the family senselessly slaughtered at Frostflow Lighthouse, I propose a volunteer corps of men and women working together to systematically clear each nest one by one. They're going to have to be well trained, versed in cave fighting, start on a poison regimen to build up their immunities and work a grid to ensure nothing is missed. In the spirit of the Dawnguard they will be uniformed and commanded by ranking officers chosen for combat experience and ability.

They will of course need to be funded and this is where the Falmer will actually help. Instead of just raiding their nests everything of value will be hauled out back to the surface to either be processed into valuable goods or sold as is. Everything that cannot be used will be destroyed. At any point in time but especially during times of strife, arms and armor always sell and even with a discount, handsome amounts of coin can be made this way.

Thoughts, comments, ideas?

Damn, you've thought this out.

But they are cute and cuddly.

Ill go into Blackreach in Chitin armor and test that

You're probably joking, but you knew what he meant.

Good man. ...I'm still gonna do it.

:'3 https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTLM_mFNbbgMClGKV8m0mtGyAh1xuzPXtMzKcXICUxyUvbWoG5gKQ

What we need is a lot of oil and fire.

It makes me wonder how they are able to use their bows if they're blind...

Maybe they see like bats do? With sonar?

What happens when you must kill the women and children, the infants?! Oh the humerity!

Bloody hell, that never occurred to me.

But somehow you can walk right past them with sneak boots on, if they had sonar you couldn't move a muscle without them knowing.

The women are likely just as combat ready as the men. You've probably killed off a million of them and just couldn't tell the difference.

Children will be brought to the surface and deposited in the Valley with the good Paladin to guide them.

I always just figured they listen and hope for the best.

But when firing a bow? That's just not natural.

There are lady falmer, and they do have boobs. Most, though, seems to occupy the shaman/battlemage roles, while the males are all warriors/battlemages/archers.

As for the archery question, I'm going to assume they pull a Toph, or have REALLY good hearing.

Plus their tunnels are so dark, I have to cast mage light on my follower just so I can see. I snuck past one and my follower did also, and then turned around and there were 3 of them. Yet when you do the Thieves Guild quest, you have to go through a hoard of them, and if everyone sneaks, you can go right past them.

Not at all. I shoot a bow in reality, and if you hear the general area of something and you know the terrain, you can estimate where head or heart-height is. Especially if it's done in a split second. A falmer hears a light clanking and thinks, "spider" so he aims down making sure to keep the bow straight. It's probably not the most accurate shot, but I'm sure he could manage. Plus, they have swords if their enemy gets closer.

Dwemer Nuke + falmer = fireworks