The Women's and Men's QF on the schedule today are not priority. If it comes to it and there is only a small window of play, they will spread out the 4 Round of 16's on different courts.
US Open: Today’s weather forecast calls for intermittent drizzle with some possible periods of dryness this afternoon. We continue to monitor the weather and will make every effort to play today's scheduled matches.
Wicky and Caro did not play indoors in 09. They were on Armstrong while Serena/Kim was on Ashe. There was no TV coverage because of all the rain and such, IIRC.
Indoors is set up like a practice facility. No spectator room at all. Would never happen unless they got so desperate.