A few months ago, when US soccer announced DA, I argued that DA was needed just based on the butchering that I saw of a U20 or U17 US team at Stub Center at the hands of a Japanese team. The US team was completely outclassed, just like we saw a few days ago in this world cup. Some posters replied that there was nothing to worry about, that we have college soccer and that automatically fixes the situation in older teams (sure, just like it has been doing for the US men in the last 70 years). The rest of the world has finally caught with the US when it comes to women soccer.
The physicality and speed of the US player is not a problem, it is a blessing. The problem is that, on average, they are technically not as good. When you have 10 players that are not as comfortable on the ball as the opposite 1o players, it does not matter how many times you ask them to connect passes, it will not happen. But do not fool yourself, if the players are not physical, deaf touch will not take you anywhere at a high level. Everything comes down to good coaching (making sure that the player is comfortable on the ball, making sure that they connect passes) from an early age, and the accumulation of many hours with the ball on your feet.
A residency program, for a country of the size of the US and with the very large number of girls playing the sport, makes little sense. What parent is going to let his/her 10 year old move from LA to Ohio, when there is no need for it and zero economical incentive (no professional game)? There is no need for it because only in SoCal, in each year group, there is a dozen of players that have the potential to be international players, and a few dozens that are not far behind. They can practice locally (at least in SoCal, Texas, NJ/NY). But they need to practice well, that is they need good coaching.