1) Every multiplayer game I've ever enjoyed playing has had small teams. I've never gotten into PlanetSide or Battlefield or any other large-scale multiplayer game. There are more people like me than you know, and games don't have to be large-scale to be successful.
2) Then why do controllers need aim-assist to be as good as mouse and keyboard? You underestimate the accuracy and exacting movement control of M&K. I have no problem at all with it, despite only being an average FPS player.
The only aspect that's even close to killing the game is the release timing. They should have waited so they weren't sandwiched between competing releases. That, and they haven't had much advertising for the game.
I never played the original Titanfall due to not really having the time for gaming at that point. But I've got 447 hours clocked in Titanfall 2, and it's an awesome game. Some people seem to think it was supposed to be an expansion of the first game and so are disappointed in the changes. But if taken as its own game, it's definitely a step in the right direction.