Now, Warner Bros. has decided to take things in a different direction and is going back to square one on The Flash screenplay.
There is not telling if Warner Bros. will slide something else into the now surely vacant slot that was intended for The Flash.
Beyond that, it all depends on just how long it takes Warner Bros. to get a script finished and a director who sticks for The Flash solo movie to actually get going.
Interestingly enough, on the TV side of things, The Flash on The CW is killing it.