I disagree; I believe any lawsuit brought against Chamberlain today would be dismissed for lack of standing. Further, even if it wasn't, I think you would have a very hard time convincing the court that open sourcing their code is a reasonable remedy.

Best case, I think you'd get your purchase price back. I'm not sure how you'd argue that remedy is insufficient, either - hence why my preference is to have the cause of action written into the law we're imagining here. It'd be even better if we can write in that the remedy for a degradation of the service is an open mechanism by which the user has sufficient level of control as to recreate their desired functionality.