The future of The Flash in the DC Universe is a large question mark among fans. Grant Gustin, the actor who played The Flash in the Arrowverse, recently discussed who should be cast as the Scarlet Speedster for James Gunn's new DC Universe. Gustin wouldn't say. He made light of the situation and said he wouldn't provide any good casting suggestions to DC.
This leaves the question open regarding who will don the red suit next. Gustin's statements are made as DC is in a hiatus period of developing The Flash following the previous movie's failure at the box office. People have been eager for Gustin to return as The Flash, particularly since James Gunn has expressed that he wants to work with him.
Gustin's refusal to nominate a new actor and his willingness to return have kept the discussion going. The future of The Flash within the DC Universe is unclear, but Gustin's stance has positioned him at the center of the debate.
Grant Gustin's remarks regarding The Flash casting
During Comic Con Liverpool, Grant Gustin was asked who he believes should play The Flash within the new DC Universe. Gustin chose not to suggest any names. He joked,
“I’m not giving them any good casting ideas.”

This response was lighthearted but also left the door open for his own return. Gustin’s time as Barry Allen ended in 2023 after nine seasons of The Flash on The CW. He also appeared in several Arrowverse crossovers.
Since the show's finale of his series and the poor reception of the recent The Flash film starring Ezra Miller, audiences have been in favor of having Gustin reprising the role. Gustin's statements make it clear he is open to the possibility, should an opportunity present itself. His refusal to name a successor only adds fuel to the speculation.
James Gunn's take on Grant Gustin and The Flash.
James Gunn, co-CEO of DC Studios, has spoken about the possibility of working with Grant Gustin in the DC Universe. Gunn said he would be thrilled to collaborate with Gustin in the future and referred to Gustin as an "incredibly talented performer." Gunn's words have fueled rumors that Gustin might appear as The Flash in the new DC Universe or assume another character.
However, no official announcements have been made. Gunn's endorsement of Gustin has further motivated fans to wish for his comeback. Gunn also stated that DC is putting a halt to working on The Flash after the previous film underperformed. The break allows time for the studio to think about its future actions and the actor who will portray the character.

The Flash's future in the DC Universe
Presently, DC Universe's future for The Flash is uncertain. The previous Flash film, which starred Ezra Miller, performed poorly at the box office. This prompted DC to step back and reassess the plans that they had for the character. There have been fan campaigns for Grant Gustin to return as The Flash.
Gustin's fame from the Arrowverse and his extended stint as Barry Allen have established him as a fan favorite. DC Studios has not announced any casting choices for the new DC Universe.
There is still a chance that Gustin might be back, given James Gunn's encouraging remarks. For now, the future of The Flash in the DC Universe remains up for grabs, and fans continue to wait in anticipation.
Grant Gustin has not suggested anyone for the role of The Flash for James Gunn's new DC Universe. He jokingly remarked that he did not provide DC with good casting ideas, which keeps things open. James Gunn praised Gustin and mentioned that he would love to work with him, but decisions have been made public.