The following contains spoilers for The Flash #786, on sale now from DC Comics.
Everyone knows that Batman is one of DC's most popular characters, if not the most popular. As such, a lot of attention is given to him and his wider cast of characters. It's seen his allies grow from simply Alfred and Robin to an entire great big Bat-Family, one deserving of multiple different titles just to keep up with it. However, the actual size of this family may be a little out of hand, as a Dark Crisis tie-in just proved.
Although the Flash Family rescued Barry Allen from his Dark Crisis prison, that didn't mean they were done with the ongoing event in The Flash #756 (by Jeremy Adams, Amancay Nahuelpan, Jeromy Cox, Peter Pantazis and AW's Justin Burch). When they got back, they were immediately drafted into the global fight against Deathstroke and the Dark Army. DC's speedsters were tasked with helping the other major teams of the DC Universe reach every corner of the globe, to respond to each threat as quickly as possible. Each team, like the Justice Society and the Titans, was tasked with defending entire continents themselves. Surprisingly though, the Bat-Family was tasked with North and South America.
Dark Crisis basically just stated that the Bat-Family is so big that they're on the same level as the JSA and the Teen Titans, which themselves are on the same level as the missing Justice League. No other superhero family has those sorts of numbers. The Flash family may have been traveling all over the world, to every continent, but that was more because of their powers than anything else. Not even the Superman Family was tasked with a whole continent on their own, even though their powers solo would allow them to outclass most heroes.
In fairness though, the Bat-Family has grown incredibly large over the years. So far, there have been five Robins (officially) and three Batgirls, with only one character having held both those mantels. That isn't even counting the other Bat-Family members that don't fall into those categories, like Signal, Batwoman, or Batwing. There's even some debate over whether characters like Huntress should be included. Although, in recent issues, the answer seems to be yes.
The fact that Batman has Batman Incorporated, his own global team, to call upon may influence the decision here. However, they were nowhere to be seen in The Flash #786, or in Dark Crisis in general. From the looks of things, the Bat-Family referred to in this issue is simply the standard roster. Its members have been portrayed on equal footing to the JSA and Titans in other Dark Crisis issues, with Oracle and Damian Wayne joining the briefing of the major DC teams in Dark Crisis on Infinite Earths #4 (by Joshua Williamson, Daniel Sampere, Alejandro Sánchez and Tom Napolitano).
It's not just this one issue of the Flash then, but the whole Dark Crisis event in general. They do have the numbers to make up their own Justice League-style team if needs be. In fact, Batman has even done so on more than one occasion, by forming the Outsiders. Then there's also the aforementioned Batman Inc. too. Assigning the closer-knit Gotham heroes to patrol all of North and South America shows the faith in the Bat-Family in general.
What this ascension to Justice League level really means for the Bat-Family is how much faith DC has in them as a brand. The Batman brand more generally is huge and, whilst the Bat-Family doesn't get as much attention as they deserve in other media, they do in the comics. This shows how much time and effort DC has put into developing these characters and adding to the Batman mythos over the years. More than they do for most of their characters. Really, what Dark Crisis is saying here is that the Bat-Family, in the position it's in currently, could break away from the DC Universe with its colorful cast of characters. They're so big that they rival the Justice League and so dense that an entire universe could form around Gotham alone.