I don't know that you can really know what the situation will be this year because of so many places, especially on the French side, that have not yet reopened after Irma. As of now, there are about 5 restaurants open in all of Grand Case. Historically, September was VERY quiet on the French side but the Dutch side, pretty much everything stayed open. I suspect pretty much everything will remain open this year on the Dutch side, but tourists are way down in general. Honestly, the island needs tourists now and IF you manage your expectations, pretty much everyone who has gone this year has had a wonderful trip. Your mileage may vary.