Ugh. Always get the insurance!
DVC Rental Store -- the store, the company itself, not the owner -- will issue you a credit? Are there any restrictions to that credit? If it behaves like an airline credit, I would consider paying the balance in full and gird your loins between now and September. Be flexible with travel (luckily, it's very cheap).
That way, if it's open in September... you can go. If not, take the credit and rebook +11 months ahead.
Possible worst case scenario is that DVC resorts are open but parks are closed. BUT, since VGC is embedded inside GCH, I can't imagine a scenario where DVC is open but park and hotel are closed. This is different from how WDW DVC properties operate. Argument against this is that Disney presented reopening plans that had the hotels lagging by a week, so that bodes well.
But my vote is squarely in paying the balance, so long as you are 150% sure it's a relatively unrestricted credit if it is cancelled, and that you will in fact travel during a pandemic to make a September booking/reopning.
No, but it's the trend and trajectory of restrictions that does not bode well for DLR. It seems contradictory if, in the same breath, the Gov announces
more restrictions on indoor spaces while simultaneously allowing large gatherings in indoor spaces in theme parks. I get that theme parks have always been considered separate due to their city-state-like operations, but I just don't see that happening in this environment.