Currently, phone CM’s packages through June 21 can be modified to new dates through 2020 only at DVC or FW. Phone lines are jammed right now. If you don’t plan on rescheduling within those parameters, I would suggest not calling to help the lines and CM sanity. As a TA with an amazing agency, no mention of resort closures has been shared yet. Something is coming but nothing Disney office yet.
My opinion, I agree that if we could modify into 2021 - even just basic package with room only, they would see many cancellations for 2020 at that point. Most of my August travelers want to move to 2021 - but we can not yet.