I guess it's because people don't buy the "one size fits all" approach to databases anymore...
15 years ago, you had to choose between Oracle, db2 or Sybase... The SQL offer grew significantly too since then.
You're probably right: nosql DB developers spread their efforts too thin. I'm currently only interested in new DBs if they solve a new problem (statistics and behavior DBs look promising).
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I guess it's because people don't buy the "one size fits all" approach to databases anymore... 15 years ago, you had to choose between Oracle, db2 or Sybase... The SQL offer grew significantly too since then.
You're probably right: nosql DB developers spread their efforts too thin. I'm currently only interested in new DBs if they solve a new problem (statistics and behavior DBs look promising).