Bitcoin Nodes don't relay a more than 1Mb Block size, it's all.
Simple.
The majority win.
Miners are not the majority, they follow the path (of all nodes).
The large block miners will not require small block nodes to propagate their solved blocks. Small block nodes will be routed around. Node operators can choose to follow the operational chain that is processing the bulk of transactions, or they can choose to follow the essentially non-operational chain which is nearly stalled. Nodes have that right, and they have that ability. Other than that, non-mining nodes are powerless.
You talk calmly like you know what you are talking about and you know what will happen. You don't and you can't.