No need for data streaming which will have issues with continuing subscriptions, bandwidth, privacy and dispatch/MEL issues. And it can still be disabled via a CB.
There are already floatable 406 MHz ELT devices with impact or pilot initiated release that include CVR/FDR.
Because they have an internal battery, they can't be turned off readily and can have tamper resistance.
The
Crash Position Indicator just needs the industry and public will to be carried on jetliners.
Example at link (this is a low airspeed FDR model, but they have been mounted on jets too, with secondary CVR/FDR).
http://www.hr-smith.com/images/stories/503-CPI.pdf