Despite being one of the most popular maps, LV has a number of flaws that limit gameplay variety and encourages stalemates. The fact that "fog" needs to exist at all is a direct admission by mappers of LV's failings. Change is needed, and here are some ways I think it could be done.
Remove the North Lake
Its a giant tumor at the heart of the cave system that is worse than useless for xenos and only marginally useful for marines who have already won the match. Pave it with rock. Make it all weedable. Replace it with a giant predator pyramid. Just make it something that isn't a giant middle finger to the hive or an unlucky survivor.
Fix Western Caves
No, not the cave section with the water pool. I'm talking about that one cave just south that is nine times out of ten a dead end for new xenos to get cornered in. The cave section that is so unless people don't even think about it. Make it permanently connected to the rest of the cave system, or get rid of it. Otherwise it is wasted space that has no value to either side.
Remove the Two-Tile Chokes
Two tile wide choke-points are bad for either side when you have 100+ players. Xenos can't push because their numbers get bottled up and picked apart by marine gunfire, and marines can't push because only two or three of the 20+ marines can actually fire at any given time. Eastern caves is a particularly egregious example. This leads to ridiculous stalemates that no one enjoys, especially when the other "flanks" can be easily held by a tier three and a few other xenos because most of them are ALSO two-tile chokes. Choke-points are important for xenos, but this is ridiculous.
Move the LZ Tunnels
Tunnels shouldn't exist where burrowers can't dig pre-drop. Plain and simple. That tunnel by cargo dome? Remove it. The tunnels south of secure dome? Gone. You don't see tunnels pre-built in the kitchen on Prison, or in Marshals on Big Red, but for some reason that's the situation on LV. Move those tunnels to useful locations that DON'T get blown up the moment marines land.
Reduce the Amount of Windows
I swear whoever originally designed the buildings of LV must have been a voyeur, because the number of windows is absurd. Most buildings have more window frames than actual walls. They are ugly, amateurish in design, and are useless to all factions. Xenos can't use most of them for cover to rest or ambush marines. Survivors can't hold in any of them. Marines can't realistically fortify them. They are nothing more than circles of waist-high cover. Change them.
Not everyone will agree with me. I'm fine with that, go ahead and tell me why I am wrong. But no one can realistically deny that LV is showing its age as a CM map. I personally despise it and could go the rest of my life never playing on that map again. However, the simple majority of players consistently disagree. If we can't get rid of it, could we at least make LV more fun to play on?