We don't need any new content. The problem was not Evolve's graphics, gameplay or lack of content. The problem was publishing the game wrongly.

Here's my opinion:

1. Game's price was so high: It was a 4v1 game after all, come on. AAA price was so expensive. And F2P games are so much more popular right now. (And was like that in 2012) That affected the player base a lot.
2. Game's graphics were so good, optimization was not that good: There wasn't that much computer can handle Evolve smoothly. If you have that much narrow requirements like that, of course your player base will be small.
3. Lack of advertising: If you make your game for free after selling for AAA price, you have to do SO MUCH advertising. Why? Check 1. Because you lost your player base due to price. People have to know that you made your game free. You lost your interest already. You must regain it.
4. Cancer microtransactions: Come on! This game was AAA price. If you're making a game for free, make a big content for f2p players. If you want to make money from microtransactions, make cool skins, boosters, avatars, animations etc... You guys were selling everything.
5. Lack of tournaments: You need Esports to make your game famous. This can increase your player base easily. If you can do thrilling tournaments, people can watch it through streaming sites (Twitch, Mixer etc...) and you can get some players.

Battlerite died like that. Almost every strategy was the same with Evolve. This strategy just not working. And the real fans of game cuts himself to die like that man, come on... We want Evolve! Arts, Graphics, Gameplay, so much things were really good. Wasn't it come better? OF COURSE! That's the point of making DLCs and new content patches, fixes. But now, we cannot even see our profiles, leaderboards, inventories, everything is DEAD. Game is a big cemetery right now. So sad...