Dunno how prices are not climbing either.
Price doesn't follow difficulty.
Difficulty follows price and profitability.
Although, lately, even if profitability goes down, the network speed doesn't go down too much. This is a good development.. it means there are more dedicated LTC miners than there was some months ago, thus making the network stronger.
I am very excited for the future of Litecoin, I think it is quite bright!