At this point if the game isn't sold to some company that will actually work on it, it will sizzle out of existence. The main problems has already been stated an infinite amount of times.
1. Game content becomes stale
2. No new content is released to prevent point 1.
3. The learning curve is gigantic.
As a somewhat old player considering I started playing in 2010, when I got fired from GameMaster/Event Squad I came to a realization. What the fuck am I doing here? I had been playing purely because of Friends, Staff, and my love for the game. A lot of my friends have left, I got fired for being lazy, and the game grew stagnant. Play ABD, get shit on by a some dueler, rinse and repeat. As a player more oriented towards MP and not diving too deep into the realism aspect, I had nothing else to do. Events, Bets, and goofing off excluded. A portion of 2016 was me not getting on because I was having fun. "Oh shit I gotta host" sums it up. Dicking around on the forums and IRC are much more appealing at this point, because that way I can communicate with friends and the community without playing the game I am entirely bored of. I much rather play a game like League or Counter Strike (At one point I played TB because it was all my potato could run) that doesn't fail to amuse me.
So... How do we fix this?
The learning curve is something that has to be accepted by new players. No fixing that without changing the game drastically, and that obviously isn't happening. Fist is right on the fact that advertisement is NOT a viable option at this point. It'll just end up being the same. Huge influx, they play for a bit, realize this game is hard and dip. However things can be done to fix this.
For one, improve the fucking tutorial. It's legitimately not good Here are you controls. Embrace them, and learn to click them. LEARN HOW TO THREE WAY SPLIT YOUR ENEMY! Need a move that won't work in MP? Say no more, pal. After the useless tutorial, you can fight uke who primarily snapkicks or grapples. If the new player somehow gets past the cycle of 4/5 turns Uke actually moves, they just get tossed into a beginner lobby.
What kind of shit is this? It's so outdated it hurts. But instead a Matchmaking system, getting 1mil TC by pubstomping newbies, and a new fancy shop ingame is much more important than the game itself. Money > The game. There are really simply fixes to this kind of thing, really. Teach how joints interact with each other. Actually teach and elaborate on viable openers in the tutorials for mods that are primarily played. Something more detailed and informative yet simple to a new player. The forum is also very good for new players to have access to. I'm sure most of the Steam community doesn't know it exists. I've always used standalone and didn't know about a forum until I needed it. For a clan application, or something of that sort.
I'm no mod maker but I'd assume with this engine(?) And the modmaker, creating interesting mods that are fun and playable is hard. Most of the mods in the huge list aren't even operable. To a new guy, they likely have no clue what a command even is until they stumble over /help. Or how gamerules work. It's an endless list of easy fixes that could make this game enjoyable for old and new players.
If I'm incompetent let me know, or if I restated already made points.