The problem I've seen described by some is that the industry is resistant to expand capacity right now, because a partial pop of the AI bubble is expected aaany time now for months, but it keeps not happening. But if it does happen and they have too much capacity, the whole GPU and RAM industry would not be able to recoup that investment and would collapse.
People confuse themselves with the bubble-metaphor. If an AI bubble exists and pops (we need not discuss either) the already existing and on-the-way-demand will not just disappear. Millions of todays users will not just decide that they don't want to use claude code or chatgpt anymore.
Instead, an increasing number of people are going to want AI stuff from here on out, forever, because it's proven to be good enough in the eyes of hundreds of millions and that will create continuous hardware demand (at least because of hardware churn, but also because there are a lot of people in the world who currently don't have great access to this technology yet).
I don't know how much optimization will drive down hardware per token, but given that most people would rather wait like 5 seconds instead of 15 minutes for answers to their coding problems, I think it's safe to assume that hardware is going to be in demand for a long time, even if, for whatever wild reason, absolutely nothing happens on top of what has already happened.
Western (+allied) firms should 100% be worried but they are in a difficult spot: risk losing out on market share or risk overcapacity. The Chinese have the full might of Federal/State Governments behind them which may allow them to survive overcapacity, not so for the western firms.