Though I don't think the standalone Chanel boutique will close in Tyson's. If it does, there's still a Chanel inside the Neiman Marcus (but it's really small). Hoping to one day visit the City Center location once it's less busy. Hopefully it'll die down in August.
I am pretty certain that Chanel Tysons will remain open. I imagine both boutiques (Tysons and City Center) will serve the entire DMV area + tourist traffic.