Any ideas how long it will take SN to send US a message that their BRU-IAD has gone seasonal and won't operate on Nov. 4?

I called US Airways and they still have it in their system and on their website.

They seem hesitant to do anything until they get a schedule change message from SN.

I'm wondering if they'll ever get the message.

Any suggestions? Again this is a return business class on the following routing.

JNB-ADD
ADD-LHR
LHR-BRU
BRU-IAD
all connections

I don't think I can get US to rebook any Star carriers (such as UA) non-stop LHR-IAD but I'm hoping they'll use OneWorld from somewhere such as JNB-LHR-IAD or at least LHR-IAD. However, I'm concerned they won't mix and match Star Alliance and OneWorld. Will this be waived in the event of schedule changes?