everybody harvesting knows that most blocks have no transactions....and I do not see a lot of change there,
I guess it is fair to say that the marketcap of NEM can only increase if the network grows faster (=more wallets, more transactionsday)
I think the same goes for almost every single alt out there. New 'users' arrive on exchanges and stay there. They're parking the coins for a bit and then moving them on to the next owner without ever meeting the real chain.
The ones that do have some action in terms of transactions and increasing users are mined in the main.
maybe it would be an option to implement an new kind of reward system which would incite the people to keep their coins in the wallet.