The size of a 72-inch sofa depends on the size of your room, as well as how many people you plan to seat on it. Generally speaking, if you have a large room and plan to seat multiple people on the sofa, then a 72-inch sofa may be too small. On the other hand, if you have a smaller room and only need seating for two or three people, then a 72-inch sofa could be just the right size. Ultimately, it's important to consider both your needs and space before making a decision about whether or not a 72-inch sofa is too small for your living area.