You have missed the multiple posts regarding this in various other threads.
No, the Vault is not dying, it is actually GROWING, and being moved to a new set of physical servers, during this process, at various times, different pieces of the vault will be down. But Maximus and BeyondThePale are working hard to get the new system up and running as quickly as they can. Remember, NWN is not the only game supported by the Vault in general, and that it is NOT on a single computer type of system, but a large server array. It takes a heck of a lot of effort to move things. Be patient, and, if you really feel it necessary, send an email to BtP and/or Maximus and ask them the status. If/When they have time, they will respond.