Photography will continue to dwindle as technology makes it more and more of a commodity. What arts like painting and illustration have always been, will be more like what photography becomes.
I'm a creative director for a small company and we don't have a staff illustrator. Nor do we have a staff painter, photographer, videographer, motionographer, php developer...etc...etc...etc. I literally could not create enough work for any of those positions on a daily basis as we rarely if ever need the skills, and what one person could do as a full time employee is leaps and bounds less than what individual contractors can do. What does this mean? You probably won't be finding a full time photography job any time soon. At least not one that pays very well.
This means you'll be working for yourself, and any time someone works for them self they better be a good entrepreneur otherwise their business will not make it. This means the first thing I suggest is become a professional in business, not photography. You'll need to know marketing, law, and every aspect of owning a business. In the beginning photography will be the last thing you do as a result of building up a good business, eventually that starts to flip (where you get to focus more on the photography and hire people to manage the business).
This is a bit cut and dry, granted.
Commercial photography is a great place to start, and I don't mean product photography. I mean marketing and advertising, or concept photography. Things that make people question how you shot it, or make them laugh at the hilarity of a photo, make them question existence, etc.
Photographers that sell their photos will soon be falling behind (and many already are).
The successful photographers are selling their creativity and their brand. This is the same for most businesses and one that is quickly snuffing out the old mindset.