The odds of a successful cryonic revival may me one in several thousand, or five percent, or ninety percent; the error bars on the various sub-parts of the question are very broad.
But if those assumptions work out, and if at least some people placed in suspension in the near future will be successfully revived in the far future...
... then are there any useful arrangements which can be made now, which have little-to-no present cost (beyond the cryonic arrangements themselves)?
For example, if someone were to make an announcement along the lines of, "If anyone makes a promise to try to assist in my cryonic revival, and to assist me in getting myself established thereafter; then I promise to try to assist those people with their cryonic revivals, and assisting them, ahead of anyone who hasn't made such a promise.", then what downsides would there be to having made it? Would making it create any perverse incentives, which could be avoided? Do the potential benefits, especially the benefit of a potential increase in the odds of being revived, outweigh the potential costs?
Would it be better to make promises to specific people while one is alive, instead of making an open-ended promise? That is, I might try to convince EYudkowsky to make a mutual-assistance agreement with me personally, in hopes that one of us will one day be able to help the other; or I might make the agreement so broad that people can make their promise to help me even after I'm dead.
How large would the benefits be of unilaterally promising to help someone else, without even asking for a reciprocal promise? Or, put another way, how big would the costs be if I were to simply announce that, if it's ever in my power, I'll try to assist in EYudkowsky's revival?
Does anyone care to try figuring out the Prisoner's-Dilemma-like aspects of this, such as the probability that someone in such a pact would renege on their end of it, and how the terms could be adjusted to minimize the benefits and maximize the costs of such anti-social behavior?
EY has already convinced me that he'll put effort into getting everyone who's frozen revived once it's possible, and in the process has given me hope that there are good people out there who'll do that simply because they want to. In return I've resolved that if I am revived, I will also do what I can to ensure that everyone else who can be revived, is. I'd be kinda surprised if this isn't a common sentiment among most cryo-patients. So I'm not sure there's any need for specific one-on-one agreements to revive. Help to revive everyone.
That being said, probably the best way to get other people to care about your revival specifically is to become important to them. Therefore - convince your close friends, lovers, and family to get suspended. Alternately, become semi-famous so strangers will be interested in you too. But the friends/family route is easiest, helps to keep more people alive into the future, signals caring, and will start you out with a ready-made social network in the future!