I'm not gonna lie, I read the first 5 or 6 posts, and then skipped the rest. So, I apologize if someone already made this comment.
I think they should stay, because ultimately, a server admin can set up the drop rate to anything they want. Basically, I think you should keep all options and avenues open, and let the server decide what to make available.
I've seen plenty of servers, already, that have no C4 crafting. If there was public demand, I am absolutely certain "NO CRAFT, NO M4 DROPS" and all these other lovely tags for servers will start popping up.
Agree here on keeping all options and avenues open. If facepunch is working on an item editor, then they want to crowdsource the game. I think they also want us to play the game how we want to.
To quote Garry Newman: "Every decision we make is pushing emergent gameplay. So the players themselves decide how the games are made. We give them the tools, they make the world." from PC GAMER http://www.pcgamer.com/2014/01/08/rust-interview/
In the end, we all have our own opinions on how Rust should be and all of this will help make the game better and more of what we want it to be.
In regards to weapons, I don't want all primitive weapons and I don't want all military grade weapons either. Something in the middle should work and then finding the balance will be tricky. For example, why use a bow now? Other than getting a few animals in the beginning after spawning, you don't. But what if the bow caused a player to be crippled or HAD to use a special healing kit to remove arrow? Suddenly the bow has more relevance.
Then perhaps, make ammo more rare or harder to make for a military weapon, forcing you to be judicious in who you shoot at. Or, and a idea I like: You can craft military weapons, but not exactly as you found them, because you have to use what you have around you for materials. And... crafted weapons have an unpredictable nature that might backfire or fail you in combat. However, perhaps this unpredictable nature could be minimized somehow...
So if facepunch can't come up with a good balance forcing players to not all gravitate towards one style of weapon, then yes, military weapons will be the standard or have to be removed entirely.