I fully support this. I really want to see what the official box can do with a full siege server.
My personal suggestion? How about an organized siege event? Set a day for people to meet up on the official siege server. This might also solve the complaint that "people suck on siege", since if a bunch of clans participate, we could get some really good and co-ordinated games going. This would help populate the server, and could be a regular thing.
It wouldn't be bad strategus castle battle practice. I think a lot of people are rusty with their laddering.