Physicists are enabling increasingly large quantum systems to go into a superposition state, now reaching a stage involving many thousands of particles. From what i understand they seem confident they can carry on this trend indefinitely. However doesn't decoherence impose some limitation on how many particles can be in a superposition state. If they were ultimately able to successfully carry out an experiment that took a macro sized object into superposition would that not violate the idea of decoherence? I have been under the impression that decoherence, although not strictly proved, is generally accepted by most physicists.