Agreed, but if we are primarily only using the main bitcoin layer as a settlement one, large mining operations might choose to downsize, or more likely sell the equipment that might make the purchaser an roi over a period of years. With tinier nanometer technology being the future, there is only so small we can go for the time being before tech advancements end up taking place over 5 or so years rather than in a few months. Think of gaming console generations and the time between them.