Ditching Olympic sailing will not have any beneficial effect on sailing in the US.It would pull a lot of grassroots funding, coaching and learning opportunities out from the sport.
I get that it's broken in the USA. but that doesn't mean it's broken everywhere. Maybe it would be better to fix it in the US, rather than just dumping on the event?
A large part of US sailing is nothing to do with the Olympics. The success or lack of success of sailing in the US is dependent on other factors. The fact that a few US sailors have been to the Olympics and a few even have medals to prove it , is a good thing for the sport's image.
It does not cost us anything, all Olympic funding in the US comes from IOC funds handed out to US sailing and money raised from private sponsors and supporters.