Reincarnation just doesn't make sense. Reincarnation is the belief that when you die your soul (which is metaphysical) will eventually find another living thing to inhabit, if you're a pantheist it can also inhabit nonliving things too I guess, but this requires the belief that all things living and nonliving possess souls. There are about 7 billion people that are alive today. So where did all these souls come from? The human race had to begin small, possibly with two people like Adam and Eve, but maybe more than that. But it surely didn't start out with 7 billion people! In order for reincarnation to even be plausible mathematically the number of people alive cannot be more than the number of souls.

If everyone is taking reincarnation to simply mean that our "energy" will survive after death, then fine, but realistically your "energy" will stay in that sealed concrete tomb six feet underground until it is all consumed by worms and other creepy crawlies. At best you'll become food for grass and other plants, at worst you'll become food for worms and ultimately feces. If you're cremated your energy will just stay in the urn that contains your ashes, or your ashes will be dissolved in the water where they are spread, or be absorbed in the earth if they are scattered on land. Any other thoughts are just wishful thinking in my opinion. Although, if you put your faith in science and technology, then maybe cryogenics has something for you, but I doubt that as well. By the time we figure out how to become necromancers the earth will be so overpopulated no one would want to resurrect anyone. The Earth's only so big after all....