Here's a recent thread that might answer your question:
http://forums.legionsoverdrive.com/threads/is-this-game-still-alive.5951/#post-110425
Furthermore, any marketing attempts are severely hampered by the original licensing agreement when IAC allowed some former members of the community to distribute the game for free. I do not know the ins and outs of this agreement, but it may be possible to get a copy if you are interested, some more information is here:
http://forums.legionsoverdrive.com/threads/has-anyone-tried-putting-this-game-on-steam.5789/
I'm not trying to shut you down, I support any attempts to get some life back into this game, just want you to know what you are going up against. Several people have came back to the community with similar ideas as you, they all seemingly came to the same conclusion that it is futile. I hope you find some other way that they couldn't.
I would suggest joining this steam group:
https://steamcommunity.com/groups/LegionsPlayers if there are ever future play dates they will probably be announced on there.
In the meanwhile you can bookmark this page:
http://ls.harrymilne.com/ to check if any servers are populated, it is extremely rare that you will find someone this way.
Perhaps a good starting point would be finding a good way for people that are available to play to advertise their availability. Maybe discord has some functionality for this. I have always said to feel free to add me on Steam and message me if you see me online, but lately I have been playing some other games on Uplay and Origin so I'm not showing up on Steam. Besides, not many people find 1 on 1s appealing, one needs to do some planning and serious spreading-the-word weeks in advance to have a hope of getting a real game going.