Part 2 100% will happen. All this honestly just calls into question Part 3, more than anything. Part 2's box office has to be solid to justify all these production hurdles for a potential Part 3.
Just for the sake of
speculation, having confirmation that Reeves is indeed starting to produce projects for the DCU, and that I don't imagine him being the kind of producer who's only content to throw money at the table, I think it's fair to
wonder about the future of his Batman beyond this upcoming sequel. Not that this version would be cancelled, that indeed doesn't make sense, but how it
may evolve.
Reeves doesn't work super fast, fine, and it's true that this can be beneficial for the script. But I think we may start romanticizing that part a bit, knowing now that Reeves does have his feet in two thing at the same time. That's not necessarily the truth, but it would make sense if this long process was also due to some kind of a slow transition towards bringing what’s beyond that sequel under a same banner. In any case, I wouldn't be surprised anymore by this eventuality.
Also, without taking the greedy mentality of a movie studio wanting a Batman movie in theaters every year, I can imagine that Reeves could not be totally satisfied with only making two movies in the span of ten years or so. Without wanting to make an argument from authority, working in the creative field, the volume of one's artistic production is a
very common concern, as much as its quality. There is a constant struggle between managing to place projects, having the time to realize them, preparing the next move, etc., while ensuring that all these creations end up regularly
"coming into the world".
Bringing this back to Reeves, for reference, there's as much time between the
Cloverfield release and his second
Planet of the Apes release as there is between his signature on Batman and the potential release of this second installment… Again, it's only speculation, but to me it’s legitimate if one wonder if that longer than usual time away from the spotlight may not be eventually due to some
"creative restructuration" before getting things going faster later. I mean,
de facto, Reeves has to share his toys with Gunn now, and maybe despite their initial plans, after two years, they've found a way to actually play together.
Who knows. We'll see. It's fun to speculate, no?
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In any case, these bit of news shows that Reeves
(and by extent, Pattinson) isn’t going anywhere and that his interest in the character and his universe is genuine, intact and, eventually, larger than what he’s immediately doing with it himself.