The question is not if there are enough directories. Its are there enough QUALITY directories. There are 10's of thousands of duplicate, crappy, canned directories, YES. There are only a handful of really good ones.
When they realize how hard it is to create, run and maintain a good directory, many aspiring directory owners start neglecting their directories that turn into spam hubs only after a few months of operation. Many get sold, some get stuffed with AdSense blocks everywhere on em and some others fail to keep paying for the hosting account and...get parked. You cannot stop people from creating "directories". By the same token, you cannot put an end to those that make clone sites and promise you millions!(...) Therefore, no there will never be enough directories. However, most will die of neglect and spam and because the owners will realize that just like their own kids, directories don't grow up soon enough!
Site directories? is it useful? many people told me that it is not useful anymore to submit our site to web directories nowadays cause google have improved it's alogarithm