Nirvana is not death
only death of human body, the consiousness continue
The only 100% sure thing in human life is that we got born and will die between those two it is up to our speech action and thoughts that can say where we end up after body dies.
reincarnation exist in my understanding because we was falling in morality and virtue as heavenly beings long time ago and was"placed" here to suffer until we find the way back to bliss in Nirvana.
Buddhas path is only for those who follow his teaching same as christianity is for christians.
Crime,rape,murder wars are all sign of very low morality and inborn enlightenment wisdom.
unfortunatly i do not see a future without the above mention points. because morality in our human worl is not getting better it is getting worse.