No carrier wants to roll out a service only to have it not live up to customers' high expectations. Carriers want the fastest route to having a robust and reliable service on the market.
Some of the carriers will not be able to develop their own services, especially when it comes to delivering video content. Partnerships will be important for those who want to have a full bundle to offer but can't develop the services on their own.
The carriers are finding all sorts of new ways to make money.