[hendler]

I agree, in principle that the most dominant, important technology will be graph databases. The reason I think so is because of experience working in technologies related to the semantic web.

However, there are reasons one might a Distributed Document Store to implement a graph store - it's the index that matters. MySQL is not the same thing as InnoDB/Sphynx. Graphdb product X could be built on mapreduce +CouchDB+Lucene(+somegraphindex) .

The only thing I'm sure of, is that if anything stands out above the rest, Oracle and IBM (and maybe MS) will try to buy it.