"This is the right's best chance for people to pick a Pinochet constitution without Pinochet's signature," said Patricio Navia a political scientist at New York University.
"The political climate in Chile isn't the same as in 2019 or 2020," said political analyst Cristobal Bellolio.
An estimated 3,200 Chileans were murdered and another 28,000 tortured by the state during Pinochet's rule.
Many of the victims were affiliated with the socialist government of Salvador Allende, who was deposed in a 1973 coup.
"The issue is that if it's more right then Pinochet's constitution, people are going to reject it," Navia added, who added the loss for Boric left the leader who once promised to bury Chile's market-led model sorely wounded.