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I don't have enough background to estimate how serious the decay would be. But with 1.40e15 decays after 10,000 years that's around 3000 decay events a second (in practice most of that will be in the first few thousand years given that decay occurs exponentially). It seems that part of the issue also is that there's no repair mechanism. When something is living it can take a fair bit of radiation with minimal negative results. In some circumstances living creatures can even benefit from low levels of radiation. But radiation is going to be much more damaging to cells when they can't engage in any repairs.
Edit:Also note that the majority of the radiation that people are subject to is from potassium 40 so if this is ok then we're generally ok. It seems that radiation is not a major limiting factor on long-term cryonic storage.
The lack of an automatic repair mechanism makes things hairier, but while frozen, the radiation damage will be localized to the cells that get hit by radiation. By the time you get the tech to revive people from cryonic freezing, you'll most likely have the tech to fix/remove/replace the individual damaged cells before reviving someone. I think you're right that radiation won't be a big limiting factor, though it may be an annoying obstacle.