To clarify my earlier post on whether Evans can change: I believe anyone can change. In most scenarios, it is very difficult because so much of who we are is locked within our subconscious mind. We make excuses for that part of ourselves, and we rationalize that part of ourselves, and we cover for it as much as we can, because we are convinced that we are in full control of who we are. Our brains are quite messy things, sadly.
For most people, change on this level requires an epiphany, an event/realization that is so jarring that it forces changes on those parts of the mind that we normally can't reach. I've made reference to his need to 'hit rock bottom.' Most people who effect drastic changes do so only when they've fallen as far as they can, and the only way out is by taking an honest stock of themselves. That can be almost impossible, unless everything else has been stripped away and the only thing left is the self. No one else to blame.
Evans is, IMO, very far from rock bottom. As long as he can stay afloat on the financial and emotional support of a handful of loyal people, he needn't take a deep look at himself. That support may run out in time (and it seems inevitable that it will), but the longer it takes, the tougher it becomes to make an honest self-appraisal. Sometimes, instead of self-realization, bitterness takes over. If his reaction to losing it all is to keep blaming everyone else, then there is no hope for him.
Hence, he is his own biggest obstacle.