If you could have it tomorrow, what new feature(s) would you most like to see in a DBMS? (Try to keep it to physically possible and on-topic suggestions if you can

)
My list:
A relational data model and language to replace SQL (no surprise there then!)
Self-optimising storage engine
Generalised constraint support (full referential integrity, multi-relvar constraints, dependency constraints, transition constraints and an optimiser)
Support for multiple assignment