I'm not convinced it's a production cost issue, I think it's more to do with all the manufacturers being happy to sell at the current price point. I'm not saying there is any collusion or price fixing going on, but why would anyone upset the status quo and undercut everyone, reducing their profits in the mean time?
I think it will happen eventually, but not as quickly as people have been speculating. I'm surprised SSDs are as expensive as they are at the moment, I had expected them to be a lot cheaper by now.