I think the same thing. Disney doesn't know if they'll be able to open the parks soon, and they are loathe to sell tickets that they might have to refund. Refunding takes time and effort, which isn't free for a company, and -- even if people feel they've been treated fairly -- they're disappointed that the refund was necessary.
Here's an idea: If Disney was suddenly to say, "Hey, with things being unsure, we're going to sell those old no-expiry tickets again for a short period of time. Buy without fear, knowing that if you can't travel this year, your tickets will still be good next year and the next year and the next year," how many of you would rush to buy them?
I would. If I could, I'd buy a 10-day no-expiry ticket for every family member -- Merry Christmas, Everyone! It'd be a great way for Disney to raise some cash -- fast.