You have made a mistake in your reasoning. It would be rash to speculate that consciousness can be transferred intact from one body to another. When energy is transferred from one body to another, there is always a way to observe and measure this transfer. In most cases, can easily observe the method of transfer: whether it is through direct contact of two bodies (as is not the case for consciousness (no one believes that the dying person must touch the new born baby for reincarnation)) or through the transmission of EM waves (which again is not the case for reincarnation).
Furthermore, even the laws related to conservation of energy do not stop energy from dissipating into a form that is useless. Even if consciousness were to follow the first law of thermodynamics, that would not mean that an individual's consciousness would always be in a useful or productive form. Just as a dying person's body heat slowly transfers itself to the surrounding atmosphere after death, a dying person's consciousness could slowly dissipate into the surrounding ether and never again be in a recognizable or practical form.
No, you have leapt to conclusions not warranted by the evidence.