If doing whatever is necessary to hit 60fps meant pushing back towards the Gamescom demo, would we want that to happen? Personally I'm happier with what we're seeing now @ 30. Even though 60fps is of course highly desirable, it's only part of the package. If Evo had aimed for 60 from the start, maybe it would be a realistic goal, but unless the delay is due to them aiming for 60, and I don't believe this to be the case, 60 may be an ask too far for DC. Maybe not if there were a sequel.
EDIT: Perhaps the frame rate may end up around that shown in Killzone SP and run at 30 or unlocked at 30-45, in which case perhaps those concerned with frame-rates should be asking for locked 30fps rather than unlocked 30-45? Just a thought.
IIRC, the Chile video was direct feed, captured outside of the PS4 Share function at 1080p. Gamersyde had an HQ 1080p version.