They can certainly try. It won't make a blind bit of difference. They're 4 years down the road. In that time they've rewritten C&P and Engineers. And in fairness added quite a lot. Their mission system is borked and not fit for purpose.
Before they could ever imagine to fire that shot, they need to be ready for the huge onslaught. To be ready they need to implement balance across the board. I have seen nothing in the entire four years that convinces me they have the where-with-all to accomplish such a task. They'd need to revisit every facet of credit earnings. Nothing they do is without blatant bugs. They lack quality of even the most basic degree, so, no, I don't see this ever happenning. And being honest, I don't think they have the stomach for it. While not a 'Elite is dying' thing, Elite is definitely not foremost either. There's a new title from them in next quarter, so, while I see Elite continueing to have attention, I do wonder, How much?
And even if they did manage it... I for example on one account have 4 Cutters. Each an asset of 1.4bn ? That's over 5bn of creidts. If they did wipe credits, I'd still have 4 Cutters worth of whatever imaginary credit they use. And that's not to mention 3 Condas, 5 Pythons, and whatever else I have, plus my liquid assets which would have to be converted to their new currency. Their new as you call it de-valued currency would be huge for those players with huge fleets, as they could simply convert storage to liquid assets. And Frontier can't devalue the ships. The ships are what Elite what it is.
So you'd still have many many players with so many assets as to make the entire project unviable.
And they can't simply wipe all assets either.. Can you imagine the player reaction to that?
There is one viable way... And some will like it.. some won't.. A new Elite Title...