CVR and CDR recorders are obsolete antiques.
They might not be the latest thing in sexy electronics, but, they have one thing in their favour - They have a prven history of successfully doing the job they were intended to do.
There is a very good adage in engineering - "If it ain't broke,
DON'T try to fix it".
It sounds nice and simple to devolve everything to ground based receivers and recorders, but........
1) Who records the information?
2) Where?
3) Who has jurisdiction
WHEN something goes wrong?
4) Who pays for this service?
5) How many transmitting systems do you put on the plane to make it fail safe?
6) Do you use satelite or terrestrial radio?
7) How do you control the data volume? The comment about minimal bandwidth is simply wrong. There are according to Flight magazine figures roughly 19,000 western manufactured Large commercial jets in passenger service, plus just under 3,000 regional jets / turboprops, to say nothing of freighter conversions and Eastern bloc built aircraft. Effectively, to transmit this to a ground station, you are looking at a near real time transmission of a mandatory 88 parameters from each one. Putting the number together means that you are looking at a system acieving somewhat better than a Safety Integrity Level 4 rating.
I'm not suggesting that the current system is perfect, but bottom line - it has worked when it has had to. In the future, when we are a bit more aligned between national Aviation Authorities and national governments AND the technology fpr storing & transmitting data has improved substantially, we will likely have a land based system. But, until then.....