Beating Wii U + 3DS. There's a chance, depending on if 3DS has really peaked like some people would like to believe. No chance in hell PS4 reaches PS2 levels though. PS2 owned the market that gen, it doubled as a DVD player, and owning multiple consoles was a less expensive proposition back then. Sony's marketshare now is a joke compared to those days, and PS4 doesn't have playback ability of some emerging media format that every other PlayStation before it had to hook in extra buyers.
EDIT: I should have included that it will be a big deal for PS4 to even beat 3DS by itself.







