To be fair, that is a "you" decision. Your decision not to travel or not to rent your points has nothing to do with DVC or Disney. You are the one making the design to "dump money" into DVC while not reaping any of the benefits.
I don't think its ethical to reap the benefits right now. That's a horrible way to say "risking my life or someone elses" - if making complete use of points means that, DVC isn't a BENEFIT. But my guess is that over the 50 year life of the contract, most contracts will have a year wasted. Cancellations due to death or illness. Owners who end up on bed rest for pregnancy. 50 years is a long time to have nothing go wrong. In our own contract life, we've seen terrorist attacks, hurricanes, pandemics, cancer, pregnancy and death all impact our trips. This is the first time we will just waste a year of points - although we did end up with four people in a Grand Villa due to death.