APPL servers can handle the load. ATT servers can handle the load. Big DATA Oracle boxes sitting in ATT/Verizon/Sprint Data Centers holding account information in extremely high security scenarios CANNOT handle the load. Their primary concern is resiliency and security. They are designed to stay up, consistent and secure, not scale up to extreme burst traffic as what we will have tonight. To compensate for the load would require retooling the DBMS which will cost big money in terms of hardware, additional maintenance, development etc. It doesn't make financial sense to expand for a once yearly temporary surge in traffic. But the servers hopefully won't drop the transactions, so each of our orders will go through properly. But they will be queued in the order they are received so expect a long wait.
keep in mind that when you're running account change requests you're floating your SSN, your phone, upgrade information, credit card info, and other identifying info. You want this stuff secure (obviously). The current design is ment to do so seamlessly but it's tough.
I deal with servers on a daily basis but not big data stuff so someone correct me if i'm wrong.