This depends on your flavor of utilitarianism. Some are indifferent to trading between two equally good lives. I regard killing someone who currently has preferences and replacing them with a new person to be lost QALYs.
Depending on your flavor of utilitarianism that could be lost utility, but it's strange to call it lost QALYs. A QALY is just a length of time in years weighted by how good it is. Two people leading happy lives for 1000 years is the same number of QALYs as twenty people leading happy lives for 100. (Death does bring suffering to both the person dying and the people they leave behind, thus decreasing QALYs, but this is a relatively small fraction of the suffering someone has over the course of their life.)
I'm starting a contest for the best essay describing why a rational person of a not particularly selfish nature might consider cryonics an exceptionally worthwhile place to allocate resources. There are three distinct questions relating to this, and you can pick any one of them to focus on, or answer all three.
Contest Summary:
To enter, post your essay as a comment in this thread. Feel free to edit your submission up until the deadline. If it is a repost of something old, a link to the original would be appreciated. I will judge the essays partly based on upvotes/downvotes, but also based on how well it meets the criteria and makes its points. Essays that do not directly answer any of the three questions will not be considered for the prize. If there are multiple entries that are too close to call, I will flip a coin to determine the winner.
Terminology clarification: I realise that for some individuals there is confusion about the term 'utilitarian' because historically it has been represented using very simple, humanly unrealistic utility functions such as pure hedonism. For the purposes of this contest, I mean to include anyone whose utility function is well defined and self-consistent -- it is not meant to imply a particular utility function. You may wish to clarify in your essay the kind of utilitarian you are describing.
Regarding the prize: If you win the contest and prefer to receive cash equivalent via paypal, this wll be an option, although I consider bitcoin to be more convenient (and there is no guarantee how many dollars it will come out to due to the volatility of bitcoin).
Contest results