People sell stuff when they need money. They need money because they don't have any. When they don't have any money, they can't place the escrow deposit.

Sounds like a good biz opp. There will always be those that need or want a 3rd party to escrow the deal.
There will also be those that will need this explained and a may need a little help to understand the software/marketplace.
I've been offering escrow for years now and I do not see this as a end to those services. In fact I hope to see it built into the client for escrow (i imagine it will be alot like bitrated where I, or multi-escrowers(why choose one) wouldn't even know about the escrow unless there is a dispute or I wish to charge a fee)
I just may need to tweak what I offer and how I offer it.
Stay the course.. We are NOT there yet.
I can imagine some of the mods earlier mentioned in this thread acting as an escrow, but I dont know Id like to hear David expand on this as well.