You know, they actually can do interesting things with Lincoln considering where his character is coming from. He was suicidal and alcoholic at one point in his life and he just lost his entire support system.
Then John Donnelly, the dude he phones when he's on the run in "A Wanted (Inhu)man", starts mistrusting him right after a news report and Lincoln accidentally kills him. The same dude who saved him from a suicide attempt before. Luke Mitchell mentioned that John also functioned as Lincoln's sponsor with his drinking problem (they talk about it when they meet in that episode, "Have you been drinking?" "I wanted to, instead I called you. You're the only one I trust.")
I know most people in this thread just want his character do go away, but idk, I'm willing to give him a chance. If they work his angst properly and don't let the character get bogged down with too much relationship drama it can turn out to be pretty decent