Yes and no. If the USA sent their very best: As in LeBron, Steph, Kawhi, AD, Harden, PG, etc. then they’d likely win gold regardless because the talent gap would be too wide to overcome. But the more those guys pull out, the more vulnerable the US is.
Every region (Americas, Europe, Asia, Africa, Oceania) has a major tournament. It used to be every other year but they changed it to every four years. The Americas tourney is supposed to happen next year in early September. The way it’s set up now you have the Olympics this year, AmeriCup in 2022, World Cup in 2023 and Olympics in 2024.
But yeah I had a similar thought. I think they need to have a core group that they commit to as the team, similar to the Aussies or Spain. I know it’s harder for the US to do that because the talent pool is so much deeper but I think it’s just no longer a smart idea to throw together a team a week before competition starts and expect to march over everyone.