Here's my recommendation: start your own business.
What is Subway going to do, come after you for making ham and cheese sandwiches? Nobody has that copyrighted or trademarked!
There are several niche businesses. There are smoothie businesses, buffalo wing businesses, roti shop business, so on and so forth.
Start a business yourself, and go from there. Franchises are scams. Here's why:
1. They take 10% of ALL revenue coming in. Not profits, anything that comes in!
2. They make you buy all your equipment from a supplier only they approve of. That means you can pay as much as 25% or more over what you could buy the equipment for somewhere else.
3. You have to do everything their way.
4. Some of these places have terrible business models. They start the place up, franchise it and don't even see if it works. Often times, you are left on your own to solve any unique problems or situations.
5. You don't want to be stuck in a bad location. That happened to my last boss. It got so miserable I left. He was stupid, but still, it could happen to you. It's your money to lose.