For Mercedes, now is definitely not the time to invest hundreds or thousands of millions of dollars they aren't currently generating in this. It's an extremely risky move that resulted in enormous losses for them just 20 or 25 years ago.If Mercedes were really want to bring in a cash cow to town then they will need to go all out with a bespoke Maybach range to challenge Bentley and RR.
Despite that, I'd love to see it happen.