Agreed. The water temperature yesterday at King's Point, NY, in the estuary of the East River (about 3 nm east of the accident site) was 34.8 F. According to the standard hypothermia chart, that typically results in unconsciousness in 15-30 minutes. The two rescuers who pulled the pair out of the Hudson said that they had been in the water for about 20 minutes; being swept away by the current at a rapid clip; and would certainly have died had they been immersed for just ten minutes more.
Couple fished out of the Hudson River after single-engine plane crashes near Yonkers - NY Daily News
Other reports are now saying that the aircraft was bought by its current owner only last Thursday. No doubt one of the things at which investigators will be looking is whether unfamiliarity with the PA-32 and its systems may have played any part in the accident.