I think that anyone with at least "good" artistic skill, and a willingness to work hard, can find enough art job opportunities to stay busy and bring in some money. (However, there is a lot of competition, here on DA, AND out in the real world, so you have to be ready to put some effort into it.) This particular discussion deals with commissions (finding clients who need art, and then providing that art for them... as opposed to creating a body of work and then trying to sell it.)
The time, effort, and thought that you put into art makes it valuable to you. For art to have value to anyone else, it has to make someone think or feel something, or someone has to believe that it will benefit them in some way, or satisfy a need.
If you are going to be a successful artist you just have to produce art that will be valued as much (or more) by a client as it is valued by you, and then successfully sell it. This process requires a lot of art skill, a lot of marketing skill, connect