I don't think that's the underlying problem, and we can show that in two different ways.

(1) I think that it is plausible that cryonics patients will be revived by the year 3000. That's now a falsifiable prediction.

(2) Here's two more unfalsifiable predictions:

- The Conservatives will one day again govern Britain
- Jupiter will one day spontaneously morph into a gigantic rubber duck

Even though neither of these are falsifiable, we can still have more confidence in one than in the other, and evidence will change our confidence.