Matt Damon does not appear in "The Bourne Legacy" because the film focuses on a new character, Aaron Cross, played by Jeremy Renner. The movie explores a different storyline within the same universe as the original Bourne trilogy. Damon was not involved due to the film's shift in focus and a desire to create a fresh narrative, although he returned for "Jason Bourne" in 2016, which continued the story of his character, Jason Bourne. The filmmakers aimed to expand the franchise while introducing new elements and characters.

In "The Bourne Legacy," the point of Bourne's legacy revolves around the consequences of his actions in the earlier films. His attempts to expose the covert operations and unethical practices of the CIA lead to the agency's efforts to eliminate anyone associated with the program, including other operatives like Aaron Cross. The film explores themes of identity, autonomy, and the impact of government secrets, illustrating how Bourne's fight for truth and survival creates a ripple effect that endangers others involved in similar programs.

As of now, there are no confirmed plans for a sequel to "The Bourne Legacy" featuring Jeremy Renner. While there have been discussions about continuing the Bourne franchise, the focus has shifted back to Matt Damon's character in subsequent films, particularly "Jason Bourne" (2016). The future of Renner's character, Aaron Cross, remains uncertain, and no official announcements have been made regarding a direct sequel.

"The Bourne Legacy" is the fourth installment in the Bourne film series, but the consensus among fans and critics often points to "The Bourne Ultimatum" (2007) as the best of the series. It is praised for its intense action sequences, tight storytelling, and the culmination of Jason Bourne's character arc. The film received critical acclaim and won three Academy Awards, solidifying its status as a standout in the franchise. Each movie has its strengths, but "The Bourne Ultimatum" is frequently regarded as the pinnacle of the series.