How on earth do you equate that statement with "we don't need a DBA when we get into production" ?
Do you need a DBA to get MySQL running ? No. Oracle ? No. SQL Server ? No. That's all it means. Normal people understand that there is a difference between getting something running and deploying it into production.
Point me a doc(or a tiny little red note link, like in the 32 bit installer download page) where 10gen says that you will need a dedicated MongoDB DBA to maintain production server. You see 10gen marketing machine have successfully created a perception that MongoDB is so much magical that you don't have to worry about data. New programmers with less knowledge in RDBMS are buying this argument. And most of the time they start into development just after reading basic tutorial. This the problem GP is trying to address.