Servers do re-open. Sometimes in a matter of hours, sometimes days. When I created my character the day after CE launch, Figaro (where all my friend are) was closed all evening and didn't re-open until like 2am Pacific.
Wife created a character on Figaro last Friday and deleted it immediately because she didn't like how the looks turned out in-game, and Figaro closed in the few minutes she tweaked her character. She didn't get back in until Sunday, but it did re-open.
Figaro, Gysahl, and Selbina servers seem particularly busy and frequently close, btw. I think Mysidia is pretty packed too.
Anza: Titan 2004-2011 / Capuchin: Phoenix 2011-???