You weren't in the beta test?
Cause if you were so would you have known about the stress test on the housing server during the beta test.
500-1000 of people packed inside the SAME channel and all houses were up.
And the result from the Stress test on the zone? No issues at all, no lag, low latency, no crash or glitches.
So in other words the server CAN handle insane pressure even tho that those numbers of players will never happened on the same channel cause they are split up in many instances and channels to reduce the pressure on the server.
And even tho it would be somehow.. overloaded so can SE easily fix it by adding one serve for each zone instead of one taking taking care for all instance/channel and zones.
FYI server are cheap these days.