Let's look at this from a different perspective.
Yes, once sharing of work in the marketplace is available, you will be able to instantly do something about a situation "Like if my party meets some random person that I need to invent on the fly". Let's look into the future just a few weeks to months down the road....
Instead of hitting a shiny red GENERATE button like you'd find on any old web site, you'd navigate over to the sexy marketplace zone, casually type 'wizard, level3, Pathfinder, grumpy' into the search box. And voila, 47 fully statted and amazingly well detailed wizards will pop up (of which you notice that 42 are free from the community!) Your party now has a new nemesis and you make a mental note that you really should upload that inn map you made last week so other can use it too.