I would like to see service where I could trade digital items like: games, information, files etc. with people who don't own cryptocurrency at all.
People without crypto would pay for items with other methods of payment, Paypal, bank transfer, other payment processors etc.

Service would act as a mediator and escrow service between seller and buyer and collect small fee from each transaction.

But I guess  that concept is too hard to implement and manage in the end.