If Remme successfully develops then there are many use cases for Remme such as Remme may be useful for crypto exchanges like binance bittrex for 2fa recently many hacks, or phishing website launched so Remme will protect their uses currently Remme working with many of great exchanges for developing one click two-factor authentication that also based in blockchain
so many predictions come for Remme if Remme developed their PKI then Remme can get massive mass adoption because of because currently only one two factor authentication is best only google so Remme is planning to beats with the help of cryptography