It’s clear that DC needs to figure out what’s going on with the rest of the schedule before DC and Warner Bros. can figure out where a Wonder Woman 2, would fit in it.
Perhaps the reason Geoff Johns can’t confirm another Wonder Woman is the studio simply has so much on the plate at this point that DC simply can’t even think about any other potential films.
On the other hand, however, it may be way too early to talk about Wonder Woman 2.
At this point, DC has numerous movies already on their schedule, including The Flash, Aquaman, and Shazam.