Taking culinary to the next level
Of course this is my opinion, but I think business courses would be extremely helpful if you plan on opening a business. I also believe it is a smart idea to get years of experience in the kitchen before attempting such a big plan. Remember that your culinary education is never over, and use as many resources as you can to keep learning. Taking some business could very well help you be successful in your goals.
When it comes to opening your own restaurant, the business side of it is almost as important, if not more important, than the food. Your ultimate goal is to turn a profit, and the owner is the one who has complete control of that. A business degree is definitely a necessity if your planning on opening a place.
As said before, get at the very least 5 years of experience under your belt. Being the owner does not mean you won't be needed behind the line on busy nights!
Marketing is more important than anything you do in a restaurant, as an owner. If you can't get people through your door, it won't matter how good your food is because no one will know. "Word of mouth" is not a marketing plan.