The interesting thing will be what types of services and products are created when these developers have instant access to an entire network of users.
Discussion
100%
and the type of businesses that are possible when you can have data moving throughout apps transparently, so you can have a craigslist-style app interacting with an airbnb-style app and a twitter-like app wherever it makes sense
The possibility of mashups and hybrids enabled by seamless interoperability is exciting.