Those would be steps on the way, of course. I thought C. elegans had been done already, and anyway, there are any number of tinier creatures that can go into decades-long stasis naturally. A mouse is where it begins to get interesting, but it is future me who would be reconsidering, and I can't speak for him.
I wrote a blog post arguing that people sign up for cryo more for peace of mind than for immortality. This suggests that cryo organizations should market towards the former desire than the latter (you can think of it as marketing to near mode rather than far mode, in Hansonian terms).
http://specterdefied.blogspot.com/2015/06/a-cryo-membership-buys-peace-of-mind.html
For those signed up already, does peace-of-mind resonate as a benefit of your membership?
If you are not a cryonics member, what would make you decide that it is a good idea?