That's a great idea that's been sadly misinterpreted by fans. The Force is supposed to be the energy that connects all life, right? Well, midi-chlorians, which reside symbiotically in living cells and connect them to the Force, are an obvious analogy to mitochondria, the symbiotic organelles that exist inside the cells of every living thing and provide their energy, so that we literally couldn't exist without them. The Force is about life, so it makes perfect sense to connect it to something living, and to make an analogy with something as essential to life as mitochondria. It's a beautiful metaphor that unites the biological and the spiritual, which is utterly appropriate for a spiritual Force generated by living things.