Well, let's indeed step back and use both what was said (reportedly) during the presentation meeting and common sense.
Not sure why we would use 3DS though, not similar situations, markets or company.
First, in the meeting, it was apparently clearly said that PS4K optimized games would also run on PS4 (and before you or anyone jump on the "significant sacrifices", it has been amended, and I'm sure that a drop from 1080p60 to 1080p30 with perhaps a few less effects would indeed be described as significant by many). So no talk of exclusives (which clearly wouldn't make sense anyway).
Second, about common sense, which scenario makes the most to you?
- A dev having the "weaker" platform with a 55m+ install base as lead and targeting a satisfying common experience (1080p30 stable), knowing that the stronger one will improve from there and also be relatively easy to scale being an iteration, not a new platform
Or
- Targeting baseline (1080p30) on the strongest hardware, knowing you will be likely to either have a shit show on the weaker hardware, or drop specs so much that the F-up would be obvious to all?
When (actually IF) we ever see a 1080p30 "barely hanging there" PS4K game and its PS4 version at 900p30 struggling, then I'll call BS.
Until then, I call overreaction.