The restaurant industry is a cutthroat business at best. Many establishments come and go within a couple years or so on average. The most vulnerable are independent restaurants that aren't associated with the big franchises. One of the problems that these places suffer from initially is that they need to advertise their presence and convince the locals that they have something of value to serve. If they only serve one type of cuisine, they run the risk of alienating anyone that doesn't particularly enjoy whatever that cuisine might be. Depending on what they choose to make may or may not resonate with the local populace. That is why even the most stringently themed restaurants will still have some other options on their menus to ensure that they will have something for even the most picky of diners. Other establishments have avoided this particular pitfall by introducing fusion cuisine to their menu. This allows them to do several things to keep diners interested in coming back for more.
First and foremost is the fact that fusion cuisine generally are combinations of the best ingredients from varying culinary styles. Also the dishes may not be as spicy or intense as their non-fusion counterparts. This means that you get good quality ingredients and a more mellow taste of the culinary styles. That's not to say that the food is bland, just that it may not be as tongue searingly hot as the dish may be in its original form. Considering that the majority of the population doesn't like that extreme heat of a variety of peppers, this is a good thing. I've always thought that the hotter a dish is doesn't necessarily make it better. I find that I am disappointed when all there is is that heat. It covers up the flavors of all the other ingredients.
The next thing that fusion cuisine offers is the likelihood that more people will be interested by more things on the menu. The diners may not be familiar with some of the ingredients or methods used to create a dish, but there is a good chance that they know about the other ingredients. This means that even if they are unsure of something, they at least know some of it. They know what they like and are more willing to try new things if they at least know what a portion of the dish is and have tried it before. Change is good, though most people don't like it. That is why it's important to ease them into it.
So given the above, it seems statistically viable that a fusion cuisine establishment will actually have a better chance of success compared to a strictly singular culinary style, at least from the beginning. Once a restaurant makes a name for itself and has a good reputation with the locals, it is then more of a matter of them excelling at whatever they chose to serve.
Tim Hiller is a freelance writer that has toyed with the idea of starting a restaurant serving fusion cuisine, though is unsure of what culinary styles to combine. http://www.osorioslatinfusion.com