So it looks like DC is cutting at least 20% of their line, if the Jim Lee interview is correct (https://www.hollywoodreporter.com/he...comics-1307413).
We already knew there would be some type of relaunch after Death Metal, so a lot of the current ongoings have already been canceled, but now it's clear that not all of the titles will actually return, or at least not in print, as DC seemingly starts focusing more on the digital market and OGNs.
So it's likely that the highest selling ongoings will get to stick around in print, but other titles will become digital-first or be published as OGNs like Hellblazer's last arc.
Analyzing DM sales in February and March, I made this list of the best-selling DC ongoings (or maxis in GL's case) so we could speculate on which books might still be in print when DC's new plans are implemented:
Batman
Justice League
Detective Comics
Batman/Superman
Superman
Action Comics
Green Lantern (ending at 12)
Legion of Super-Heroes
Flash
Wonder Woman
Catwoman
Shazam (canceled)
Nightwing
Justice League Dark
Harley Quinn (canceled)
Suicide Squad (canceled)
Young Justice (canceled)
Aquaman (canceled)
Supergirl (canceled)
Batman Beyond
Batman & Outsiders (canceled)
Justice League Odissey (canceled)
Teen Titans (canceled)
Batgirl (canceled)
Red Hood (new direction announced)
Hawkman (canceled)
Terrifics (canceled)
I only considered main DCU titles. There are 27 in total, so I think we can expect around 20 to still be around as regular ongoing books.