To be a bit pessimistic about this.
Yes, we have an emerging marketplace, which was something Epic didnt do before. And there is the problem. They dont have the experience with that.
When you look at the missing features the marketplace still has, i am naturally pessimistic about how fast hosting and multiplayer servers could evolve. Especially when you want to have some autoscaling, this is not something easy if you are not generally in that business like Amazon with AWS, and this would be a HUGE pre-investment from Epic (1M for Loadbalancers/switches/routers/firewalls, around 800k for a minimal server setup with an ESX cluster, 500k custom development for scaling, ordering and provisioning of VMs, 24/7 support personnel, etc, etc) which can easily go up to a few millions for a BASIC equipment for like 20 medium sized multiplayer games.
Not counting in rent for a datacenter (building your own would be too costly then).
Amazon took quite a big investment and some time for building up AWS, and they already HAD the servers and most of the infrastructure already.
So, sorry for being “that” guy, but i felt i need to get that out.
Cheers,