In the Italian news today is a story about a change on some of the most popular (crowded) CT trail starting on June 1. On the Blue trail, the number of hikers will be limited to 500 at a time through the tracking of QR codes on hikers' tickets (Cinque Terre cards). When the number is reached, new entries to the trail will be slowed or paused. Based on the data history, it is anticipated that the restriction will only be implemented on peak days at peak times. The Park believes that this change will allow them to predict crowding so that hikers can be directed to other trails. One article in Italian is here: http://www.cittadellaspezia.com/Cinque-Terre-Val-di-Vara/Attualita/Biglietti-col-Qr-code-per-contare-i-camminatori-lungo-i-sentieri-260924.aspx (This article doesn't say which trail sections and says beginning in July. Ansa.it says the Blue trail beginning June 1).
The lack of specifics in this story may result in a great deal of misinformation. Like the more generalized CT restriction story of a few years ago, the headlines may be misleading, sensationalized, and never forgotten.