The keyword here is decentralisation I think. Not being centralised by a big entity means the users have to provide the services themselves. Witnesses are providing the network and the database (the blockchain). Other users provide services such as auto-vote, wallet etc...
Now in order to implement more features, we need more volunteer developers.
Why would they have to be volunteers?
The community should decide what it wants and have access to knowledge and information to choose, and thus drive development.
Reward for operation and maintenance (witnesses) should be intrinsic and expand in relation to network expansion.
Equitable positive interaction and opportunity will drive adoption on all levels, content creators, curators, and consumers but more than that, we need the individual network, preference driven, instant response capability, and multimedia integration that a facebook provides with the advantages of decentralization.
I meant just more developers, volunteers or paid for.