I was half-asleep when I read that, and it shocked me into waking up. Anyway, I'm not sure Daggerheart will dethrone D&D, but I can see it taking up Pathfinder's spot. Compared to Pathfinder, Daggerheart is mechanically distinct and is setting neutral. Plus, it'll be more recognizable thanks to...
Here's stuff from one of the artists on Battlefield 1. So yes, there is heavy bulky plate armor like that around the 1920s. It's not used as much, but it's there. Also, Keith Baker has made blog posts detailing Eberron fashion, and how people could wear heavy armor that doesn't look like...
It also helps that, after Eberron came out in 2004, other settings became more and more dungeonpunk, so Eberron would probably have to distinguish itself even further, if the early artwork's accurate.
Curse of Strahd and the Lost Mines of Phandelver come to mind. I know people that are running (and I'm in one of these campaigns) or planning to run the former; the latter has received awards and a revision/expansion.
I would quote this part right here.
"While we don’t really know how that’s affected the head count at Wizards, it’s clear from the 2025 schedule that the pace of releases is off. There just aren’t as many books coming out this year as I was expecting."