Sure, thats a possibility. Removal of foreign capital from domestic markets would, IMO, be compensated with money printing (in one of its many possible forms) for essentially yield curve control. This could be coordinated globally via a deal (Bretton woods 2.0 etc) peacefully which is my base case, or via conflict and printing is to "pay for the War" ala WW1 and WW2. Its all about probabilities, and being positioned all in on QQQ/SPX in the current environment is not accounting for these probabilities which is my entire point. Stated another way treating the current environment as exactly the same as similar events in the recent past that caused liquidity issues is perhaps unwise, maybe even foolish given the full context of the day.
I'm not saying the world is going to end, buy Gold. I'm saying that the leadership of the world is clearly stating that a restructuring of the global monetary order is underway and Gold/Bitcoin are likely to be central to that reordering. See Bessent's statements on the All-In podcast for example. If we take that at face value then it would make sense to allocate a % of one's portfolio that is equivalent with the % you think that has of happening in a way that reflects the possibility. Thats going to be different for everyone but zero is probably not a good move IMO.
Due to a number of factors that are outside of the scope of this thread I would argue we have a MUCH higher chance of a peaceable agreement being reached by the leading powers than we have at any other time in the past when the restructurings have occurred. Handwaving the entire thesis off with "Buy lead futures" has some merit but is ultimately counterproductive in the context of investing discussions.