Bumping this thread to bring up some questions rather than start a new thread.
Regarding qualification by world rankings: Even with a goal field size of 80 for the marathon (or 100 for the World Champs next year), I imagine they'll have to go pretty far down the ranking list to get there. For example, I looked at the top 300 ranked athletes in the marathon in 2017. I noticed that Kenya, Ethiopia, Japan, Eritrea, and Uganda all had more than three athletes on the list. Other countries probably did as well, but those were the ones I accounted for. Only 55 athletes of the top 300 remained after taking out those countries' number 4-whatever runners. As the list goes down, more countries are represented, but other countries also reach their quota of 3. It would take a much less busy day to go through and figure out exactly where #80 or #100 falls, but my guess it would be something slower than 2:15 or so.
Am I understanding how this works correctly? If this is the case, the US should still have a decent number of athletes eligible to qualify by world ranking, thus the top 3 at the trials would likely all be people who are qualified anyway.
For other countries, qualifying may still require something faster than 2:19:00, but maybe not a whole lot faster if my suspicions are correct. If anyone else wants to weight in or point out something I'm missing, that would be great.