Answer
No, customer requests alone are not enough to open a café. In one case, many people asked for a café in Uruguay over the course of a year, but the business still did not open one.
A request and an actual purchase are different things. A café requires foot traffic at the right times, a stable average spend, a kitchen, staff, permits, rent, purchasing, packaging, waste, and accounting. The popularity of an idea does not guarantee profit.
Before committing to a long lease, it makes more sense to run a small test: a limited menu, a pop-up, an event, or another format with real sales. The decision to open should be based on repeat orders, margin, and a clear operating model, not well-meaning comments.