This question is related to this question, but I'm specifically interested in self-induced collapse. Suppose that the size of a quantum system alone somehow leads to a projection of the state (a "collapse of the wavefunction"), i.e. the collapse is self-induced by the system, without any interaction with an environment which ultimately has some effect on the knowledge of the observer. This is not standard quantum mechanics, but answers to this question lead me to think that this is a common assumption. My question is: Would this imply that large quantum computers are impossible? Maybe there are even known limits in some models?