You should be fine. When you create an album, there is a function that continues altering the name until it finds a unique one. For example, when you try to create the 10,000th album named "Media Gallery", the directory will end up with a name like "Media Gallery(9999)". I think the upper limit is the max value for an integer, which is over 2 billion.
You may notice a slight delay as it loops 10,000 times, but I wouldn't expect it to be significant. If you want to be sure, just write some test code where you call System.IO.Directory.Exists() 10,000 times to see how long it takes.
Roger Martin
Creator and Lead Developer of Gallery Server Pro