It is possible DIsney could open resorts before the parks, meaning the combined DVC/DIsney hotel resorts, but I doubt that will occur, There is a particular issue to be aware of that actually makes it impossible to open the WDW DVC resorts without also opening the DIsney hotel resorts. That issue is the fact that the Walt DIsney Parks and Resorts company that runs WDW, and not DVC, gets to determine when the employees are brought back.
All those employees who work at, or otherwise service, the WDW DVC resorts, including those conducting front desk, bell services, maintenance, housekeeping, security, and transportation services, are employees of the DIsney Parks and Resorts company, not DVC, the associations, or DVCM, the manager of the DVC resorts. That Parks and Resorts company and DVCM have an agreement called the Property Managememt Subcontract, which you may have noticed is mentioned annually in the budget provided to members (but to actually get a copy you need to formally request one in writing from DVC), under which the Disney Resorts company agrees to provide to the DVC resorts the employee services needed for the resorts, while it is also providing such services to the WDW resorts as a whole, and the association and DVCM agree to pay the fair and equitable share of the total costs of such employees that are applicable to serving the DVC resorts.
In essence, until the Disney Resorts company recalls the employees, which it will when it decides to open the hotel resorts, there will be no employees to work the WDW DVC resorts, and you cannot possibly open the DVC Resorts without any employees to service them.