From Detective Comics #19 (or #900 depending on your point of view) we see the full fallour of the devasting effects of the Death Of The Family crossover. You kno, the one that would wreak havoc on the Batbooks, so that they would never be the same again.
And it’s true, look.
Batgirl and Nightwing are totally in a strop with Batman, won’t pick up his calls and Nightwing is totally moving away.
As you were. Still, they aren’t the only costumed Batpeople left in Gotham…