No, when you cultivate Bodhicitta, you don't lose your need to survive. You want to survive because you believe you can benefit other people.
Most Buddhist practitioners start walking the path because they personally want to be enlightened. They want this for their own personal liberation from suffering. It's a good motivation, but it only gets the practitioner so far.
Bodhicitta arises when the motivation for obtaining enlightement is no longer personal. The practitioner wants to become enlightened for what they can do for other people, not just for themselves.
This is a huge milestone on the path because an enlightened being works to benefit others selflessly. In order to become that selfless, their motivations must become selfless as well.
Bodhicitta has been noted as a significant milestone on the journey for more than 1,000 years because of this fact.
