I don't think that this is meant as a complete counter-argument against cryonics, but rather a point which needs to be considered when calculating the expected benefit of cryonics. For a very hypothetical example (which doesn't reflect my beliefs) where this sort of consideration makes a big difference:

Say I'm young and healthy, so that I can be 90% confident to still be alive in 40 years time and I also believe that immortality and reanimation will become available at roughly the same time. Then the expected benefit of signing up for cryonics, all else being equal, would be about 10 times lower if I expected the relevant technologies to go online either very soon (next 40 years) or very late (longer than I would expect cryonics companies to last) than if I expected them to go online some time after I very likely died but before cryonics companies disappeared.

Edit: Fixed silly typo.