When will we get the ability to host our own servers, for LAN gameplay? Will this ever happen? The infastructure and support is already there, its just not made accessible to us end users.

I would also find it cool, but I doubt that this will happen. Hello Games would like to see the multiplayer players online. Also, certain things would go away in lan mode, like daily or weekly quests, the weekly freighter reward, etc.
Unless of course you play online again, but then you don't need lan mode either and can just invite your friends to join an online group.

If we host our own servers, we can script our own events? We can also do the same thing hello games does, as far as allowing users to continue with existing profile offline and online OR requiring a brand new profile save to run through with. Security can be implemented how we'd like.

I don't think that will happen.

Nobody thought NMS would continue to get updates, we all thought it would be abandoned. Yet thats not the case.

If they had decided to abandone the project, the whole reason why they made that game would fail.
And the reason was that they wanted to have another mainstay besides Joe Danger, and avoid getting lost in one Joe Danger sequel after another.

Well you asked if this well ever happen. Noone can give you the answer. We all can just guess.
My guess is, it won't come. But i can be wrong, I'm not Hello Games.

If you don't like the answer, feel free to argue against it, but it won't change my point until Hello Games disproves it.