Nanluoguxiang, a famous ancient alleyway in Beijing that is packed with small tourism shops, bars and restaurants, has become a victim of its own success and will no longer accommodate tour groups because of the huge numbers of people who visit the scenic spot each day. The change will take effect on Monday, the municipal tourism authority said. More than 30,000 people visit the alleyway each weekday, and the number climbs to 50,000 on weekends and has been known to…