Your post is weird. Why would the amount of visitors to a country have anything to do with passports issued? The U.S. is less than 5% of the world's population. That's a hard limit on the amount of passports that can be issued.
The amount of visitors would be limited by the size of the tourism industry and regulations around entry visas. This is an unrelated metric.
The amount of visitors would be limited by the size of the tourism industry and regulations around entry visas. This is an unrelated metric.