Rebuilding? Won't be easy. They have only 2-3 players in the first eleven who are under 27. VVD, Matip, Henderson, Wijnaldum, Thiago, Firmino are on the wrong side of 30 or approaching it, Salah and Mane turn 29 this year. In order to successfully rebuild the team, FSG will have to invest hundreds of millions which they probably won't do.
Tbf, Klopp built a very strong team on a restricted budget. It was the perfect storm. It would be extremely difficult to repeat that feat though. He needed 4 years the first time, are they going to wait another 4 years for a new team? Don't think so.