Well everything in nature seems to work in cycles, the seasons, the revolution of planets, the rock cycle, the water cycle, electricity, light energy to heat energy to mechanical energy and so forth, so I don't think reincarnation is totally out of the question. Seems more eco-efficient to recycle souls than to keep creating new ones and throwing the old ones away. As Yoda said, "Lumionous beings are we, not this crude matter"

Then again may I'm just using it as a crutch so I can keep myself sane in my day to day corporeal life.