I think that proprietary ecosystems like Amazon Web Services will continue to grow. These ecosystems will be popular with small software developers because it saves a lot of time. Larger developers will see less benefit from proprietary software because their problems tend to be more specialized and difficult.
The main benefit of pooled infrastructure for larger developers is higher server utilization. Many of their workloads see fluctuating demand depending on the time of day, depending on the season, or depending on one-time events (e.g. ticketing companies will see a heavy server load when tickets for their most popular events first become available). They should see their costs drop by taking advantage of the elasticity made possible by pooled infrastructure.