How usable is PS4 without internet connection? I'd buy one (maybe used) if it is.
However, if you want to play blu ray movies, you need to connect it to the internet to download a license. Sadly.
It raises big concerns for archival—we'll eventually have high quality emulators for all of these systems, but to properly archive the games requires also archiving patches, which is difficult from both a logistical and copyright standpoint.
Just once.