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> It seems like the successful(popular) "NoSQL" engines will eventually reinvent many RDBMS wheels.

The wheels in question aren't RDBMS wheels, they're just generic database wheels. The backlash against RDBMSs wasn't because of implementation details like this, it was because of the baggage of relational structures in general, and SQL in particular.

The "reinvention" of these wheels is occurring now because non-relational databases are maturing now.

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Point taken.

As I spend most of my time in SQL, and have come to find a comfortable language to use, I can still understand why fixed schemas give developers headaches - especially when schema migrations in MySQL can result in extra work to minimize downtime.

I mention MySQL specifically, because most of the RDBMS -> NoSQL cases I see came from MySQL users. Coming from MSSQL, and now PostreSQL, it seems as though NoSQL is partially a NoMySQL sentiment.

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