As much as penny-pinching on safety systems is a bad habit, is the emotive "zOMG, Tell the Families!!!" really the best argument that there is for these systems?
It's been what, over three days now, with an aircraft that disappeared from radar at commercial cruising altitude without so much as a burst of garbled obscenities from the flight crew. Do you think that your family is clinging to those little flotation-device pillows, awaiting a rescue that would have come in time if only for upgraded real-time blackbox transmission?
If anybody derives some sort of comfort from whatever they do manage to find, all the better; but this is all trying to recover data for failure analysis, not survivors.
Now, if you want to justify real-time transmission, check out the amount of (incidentally not paid for by the airline) search gear that has been diverted from Malaysian, Chinese, and other sources to looking for the debris. Whole bunch of ships, airplane and helicopter overflights, diversion of what, 10 satellites? That starts to make the $100k look like savings.