ning, we don't know that your site can't get listed. All we know is, it hasn't gotten listed yet. I don't even know if it is listable. But if it is listable, that makes it one of several million listable sites that haven't yet been reviewed.
Which ones will we review first? We'll guess which ones are most important. That usually happens in two steps. (1) We guess which category needs work most, and then (2) we guess how to find the best sites for that category.
So, if your category is already well-represented (even if you like your site better than some of the others), then it may be a long time before anyone even looks.
This is not a situation that occurs only in the ODP. I've had one book, very important to me, sitting in the Project Gutenberg queue for four months, and NOBODY has even reviewed a single page! Many books, much less important to me, have been started and finished in that time. But, you know, I CAN believe someone else could work on their choice of books rather than mine. It happens. And it's OK. All of my books will get through eventually, or I'll do them myself if I get too impatient. It's my choice.
Is the ODP any different? You want site promotion: you can wait for the ODP to give some accidental help, or you can start right now, doing your own site promotion. It really doesn't matter to anyone else which you do: it is your choice.
But ... if you wait, you don't know when someone else will think reviewing your site is the most important thing on the web. And we don't know who that will be -- except that it probably won't be Gloria.
It's a good thing we all have different interests.