That's a tough one for me right now. 5 years ago I'd say if you have a full understanding and can competently do fixed and removables then go for it. Most cases are complex these days, they are integrated with implants, combination cases where you have removable and fixed at the same time. However, cad/cam is moving from being a great tool in the lab to being a must have to do what we do everyday and be able to offer the variety to your Docs. If you have the cash, I'd start a digital lab...it will and has only been getting better for the ones who moved this direction. But hey, what do I know, if you have some badass ceramic skills, you don't need anything digital, just your favorite brush. Either way, knowledge is something you can do now...be a human sponge and soak up as much of it as you can, that trinket of info will be helpful if and when you do take the plunge into this endeavor.
Oh, one last thing, and this ranks right up there with the knowledge, make sure you network. Make lab friends, lab owner friends, manufacturer friends, whether online or in person. Don't get the persona that you want to do it all yourself, that you know everything and get that defensive posture/bubble because you will need help from time to time. We all do, and it's okay to ask, sure there is trolls in any room, but be positive and appreciative and that type of attitude will take you a long ways in this industry.