I think that it's at least as important, and am backing that up with money (only $100 for now, but I may add to that number later if my financial situation improves). Cryonics requires you to be kept cold in an uninterrupted fashion until you are revived, whereas plastination would allow for cheap and easy storage in a basement. There's the disadvantage that the hardware becomes useless, but it doesn't look like even modern technology is far from making that a moot point.