Essentially they are closing up more in favor of their existing HODLers instead of opening up to a wider audience and attracting new users to the coin. I was actively following it before the hardfork, mining, trading and holding (short term), but after they changed the rules I just lost interest and I suspect a lot of other people also did.
Being able to trade long terms deposits would be interesting, however I think that this is more reasonable to be implemented on the local wallet than on exchanges. Hardly seeing a more complex feature implemented any time soon when they still have not added the option to sort the term deposits in the wallet for months... :)