I wouldn't have my brain frozen unless we have a better understanding of the fundamental stuff that makes up consciousness. The mind is more than the neurons and synapses. Yes it's a necessary condition to have a brain but consider the following anecdotes:

1. Under anesthesia, the neurons within the brain are fully connected and have access to blood and other resources of the body, yet it is not functioning at all. No pain, respiratory drive, no memory

2. Patients with large parts of their brains removed, or large parts of their brains injured by stroke, can recover fully to a point that is functionally indistinguishable from their previous intact state.