This is a very naive idea. In practice, manufacturers do not want to reduce pricing except as a last resort. Typically, a 10-15% price drop won't create enough extra sales of offset the loss of income from the price decline, and price drops have a tendency to become permanent as customers start to use that as a new baseline for negotiations. Then you become a lower margin business relative to your competition which impairs your ability to reinvest in technology and you fall further behind the competition. Price drops lead to a vicious cycle.Like any manufacturing line - you lower pricing if your utilization starts dropping, or do other things to save money. If the margins are so low that 80% utilization breaks you then you should probably raise prices or just take your extra capital and put it in VTSAX. (i.e. if you can't beat the market, why bother staying in business).
AMD limited themselves critically twice by not having enough capacity (K7, K8).
Your point about not staying in business if you can't beat the market is 100% accurate... Intel needs to get out of the foundry business and if they had done so 5 years ago I bet they would be doing very well today, but instead they are in crisis.