I use Postgres for pretty much every project possible, as well as using Oracle for consulting clients.

The main feature which I'd like the PG development team to look at next is implementing a more comprehensive partitioning solution.

As far as remaining competitive with the commercial database vendors, the one thing that is the primary reason I have seen for enterprises choosing to reluctantly pay for Oracle over using Postgres for free is RAC (Real Application Clusters). Active/active clustering of DB nodes seems to hit a sweet spot for businesses wanting uptime and scalability without some of the downsides of physical replication.