Oh my god I love that third one
Visibility has never been a problem in games, if you have nothing physical between you you can always see them or a name tag
It'd be something new to have darkness/rain actually be an issue
Maybe they could incorporate flares? Or orbs to place so you can see in a certain area? 
In a cold night, out hunting far from the tower, cold could be an issue.
Visor frosting up
Decreased movement
Maybe increasing damage as it reaches extremes
I really like this BUNGIE PLEASE HEAR US
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	What if generated orbs gave off light for more visibility? That way you really have to think about picking them up, especially in the dark
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	Oh THOSE orbs.. Bahaha I didn't know about them until I looked them up on the wiki just then.. But that'd work brilliantly
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	That's what I meant, you'll need more visibility in caves or at night. They wouldn't really be costly, but you'd have to pick them up. Or a completely different idea could be a handheld torch (that decreases aim when held)
 
										 
					 
		    