Power structures won't collapse *solely* because of new models, but I definitely see them as a way to help change the system by providing a new path to follow.
To highlight this, I'd point to the move to abolish the police. I think that was held back by not having a good alternative model to the broken system we have. I think that stalled that movement in many ways.
New models give us a direction to make progress towards and point out issues of the current system.