You are overly optimistic. That would put them among the first to sail and that is not Disney's way.
The requirements are pretty involved.
Under the new guidelines, cruise ship operators must build laboratories on board each vessel with enough capacity to test crew and passengers, as well as hire a team necessary to conduct such testing.
Going forward, cruise lines must test every crew member at least weekly and report the results to the CDC.
100% of passengers and crew must receive rapid-result testing at both embarkation and disembarkation; individuals will not be allowed to board the ship until they receive a negative test result, and those disembarking the ship will not be allowed to continue to their final destination until a negative test result is obtained. The line must have off ship quarantine space near port for passengers and crew who test positive.
To apply for a Conditional Sailing Certificate, the cruise line must conduct simulated voyages, put pre-cruise notifications in place, and make some operational changes onboard.
The ship must apply at least 30 days in advance to do the simulated voyage. The voyage has to include full check in, private island excursions, entertainment, dining. It has to be "real." Full staff.
Carnival and RCCL are further on a path to being able to do this, and neither think January is happening for them.
DCL has big hurdles to get back into US waters, contract the testing capacity, book entertainment, and restaff.