Having gone for the cheap laugh I'll do the serious answer.
Use the tools available now to convert to an open format. Probably epub is best. Open source tools are better because they're more likely to still be around. Make backups - plural. And finally relax a bit. Stuff happens.
I haven't got all the music I ever bought. I'm missing some DVDs and I I longer have a vhs player but still have tapes.
And those - films, TV and music - are items I'm likely to reuse. I do reread but not as often.
If I lost my library tomorrow I'd be annoyed sure. But I'd be losing a bunch of books I never got around to reading, some I've read once and a handful I reread regularly. Those last ones I can replace, I.e. rebuy, easily. Maybe I'm fortunate that my favourite books are readily available, but I think that'll be increasingly true given the way things are going. Things don't go out of print any more.
And that's if something happened overnight. But it won't. There'll never be a point where mobis and kf8s available one day and only kfx the next. And if that ever happened, you'd notice and that would be your last purchase from that particular store.
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