It may trade again on the 17th Bob.........PCBM did after they were halted.
The real problem will be in April. CMKX has already commented that they won't have the filings done that the SEC has given them 60 days to do. That could spell revocation IMO.
On the market maker question, yes they would need a MM to sign off on a form 15 something or other before it can trade anything other than unsolicited bid/ask
I think at this point if it were possible for the stuckolders to "call in their certs" the cert would probably be worth more than their "investment" in CMKX.
It would be a collectors item for what I believe to be one of the biggest stock scams ever.