What incentives exist for innovation on the ethereum platform, so that developers can recover investment costs?
How can a decentralized application be monetized, and are there mechanisms to deter immediate and costless replication of such an application?
For ethereum to really be the TCP/IP of contracts, it has to give people incentives to build things like facebook, google, etc. on top of it.
PS: I refer to incentives above and beyond the mechanisms driving Open Source production.