I do understand and I think this is a valid concern. It’s always possible for links to die, for torrents to go unseeded for years. At that point it would be up to the Sailor Moon fan community to upload it somewhere again.
This is why I think everyone should keep a download of the special stuff you wanna keep that is volatile (as in, seemingly easier to be lost off the Internet than other digital media), but I understand many fans aren’t able to maintain large data storage or just might not want to, or might feel uncomfortable with torrenting for any reason, or anything else.
I would hope the fandom would step up, and I think we have in many ways. One of the users here
@ChibiBoi has done an amazing job digitizing their collection of Sailor Moon VHS fansubs, which is a special, unique experience of Sailor Moon.
My experience of Sailor Stars is entirely from the VKLL VHS fansubs, including the style of translation etc. And now I can preserve that, and experience the rest of Sailor Moon this way. This shouldn’t replace the official versions (I support the series financially, I own the show on various official disc and tape formats) but it is wonderful that the fandom was able to restore a piece of the Sailor Moon fan experience puzzle. Fansubs (and fandubs!) have been a part of the international anime fan experience for a long time.
The point is, I like to think the fandom would step up again as it has in the past when a part of the franchise was seemingly lost to us.