I get what your saying but if the dollars aren't going oversees to come back, that doesn't mean they cease to exist. The total liquidity pot is what matters. You can't be a hodler and think we get reduced dollar liquidity.
There is one threat to the S&P and that's less dollars, we still are super duper very much 100% not on a path towards less dollars. There is a guy Lepard or something wrote a bitcoin book and thinks markets are going to crash and is pro bitcoin. The basic lack of understanding of the economics is mind bottling.
The reasons to buy bitcoin is because the S&P is going to 30,000 not 3000. I'm just going to spend the next 10 years repeating myself, the dollar is shit and it's going to get shittier. Yes the dollar is less shit than the euro or the pound or whatever the CCP is pretending is currency but it's a horrible no good store of value. The govts of tomorrow will rob you of your wealth via inflation just like they always have.
The one thing on the horizon that can DELAY this is automation and robotics can have a deflationary effect buying us more time. So people may map it out and say we are fucked by 2035 but major technological change increasing productivity could buy us decades more.