I think this could be prescient. Eventing has fought very hard to stay in the Olympics, for a very long time. But it seems that after each Olympics, many eventers look at the outcomes and ask ourselves “what is the point of these compromises, how is this helping true eventing”.
I think that the several national teams that do rely on the Olympics to keep stipends to riders, sponsors and donations coming in to the sport will continue to fight and adjust adjust adjust to keep eventing in the Olympics. The Americans will probably tag along with them.
In comparison, the U.S. and international endurance-riding sport has looked into the Olympics and WEG, and seems to have chucked it as not worth the necessary compromises. Plus the Olympics and WEG seem to have decided that endurance-riding is even harder to fold into the mix than is eventing.