There are a few things that are worth discussing in this thread.
I've been thinking a little more about this -- Firestorm had what we can think of as a powerful patron in his co-creator, Gerry Conway. After his book was canceled, Conway wrote him into Justice League, and also (I think) wrote the DC Comics Presents appearance bridging the two. And then, of course, he wrote his subsequent backups and then the first five years of Fury of Firestorm.
SIdeways could be in a similar position. Dan Didio, his co-creator, certainly has at least as much clout at DC as Conway did then (arguably much more, given his position). What Didio doesn't have, however, is endless time & books to actually write about Sideways himself, the way Conway did about Firestorm. So Didio can absolutely push for Sideways's inclusion in certain events or groups going forward, but it's less likely that he'll have the time to devote to doing the job himself. Will that make a difference? We'll see.
I have a question, because I think I've been a bit confused ever since this line of books came out in the first place. How were these books related to Dark Nights Metal exactly? I mean in the sense of the story. Did any of them actually take place in the Dark Multiverse?
Hmm. It was touted as "from the pages of Dark Metal" or something like that, wasn't it? It's funny that I just never noticed that it actually wasn't.
I have to say, it was at least a valiant attempt to toss more ideas and titles out there. The Terrifics are a great team, and they fill a hole in the current DCU. I just realized that they are kind of like the Challengers of the Unknown (who are what Kirby did much better when he created the Fantastic Four). The FF pastiche was obvious, but I like that they are science adventurers.
I also love Silencer, and I really hope she shows up in Leviathan Rising, what with her connection to Talia al Ghul.
Just resurrecting this thread to say that in recent weeks, we've seen Silencer in Event Leviathan, and now Tempus Fuginaut from Sideways has appeared in Flash Forward. And, of course, The Terrifics is still being published.
I was definitely happy to see Silencer back in Event Leviathan!