Whether or not there is rebirth is not the fundamental question, because once one is born here and now, there is dukkha like this and it must be quenched like this. Even if you are born again, dukkha is like this and must be quenched in the same way. Why bother talking about birth or no birth? Talk only about how dukkha arises and how dukkha is quenched. Just this is already enough. For this reason the Buddha taught anattā. Once anattā is fully realized, there is no dukkha. When there is no attā, dukkha isn't born, anymore. Therefore, he taught the quenching of dukkha, that is, he taught this matter of not-self. The teaching of anattā is essential for the ending of dukkha. Arguments and discussions about whether there is rebirth or not area waste of time. Whether "it" will be born or not, there is still this business of quenching dukkha like this. It's better to speak about this quenching of dukkha instead. This quenching of dukkha is the fact that there is no attā, is understanding that everything is anattā. (33)
We can conclude by saying that if you understand anattā correctly and truly, then you will discover for yourself that there is no rebirth and no reincarnation. The matter is finished.
http://www.what-buddha-taught.net/Books ... ebirth.pdf