There's also a HUGE ecosystem, very profitable, that after two dozen years, actually works-- expensive as it is. Oracle DBAs and SQL coders aren't the sort of person that's after the latest "edgy" new db scheme.
I would venture that most of them don't like JSON, have no clue for hadoop, and are the online/never-fail sorts. They're not going to use REST against an AJAX app, are clueless about puppet, and believe in middleware. Not gonna get them to fix what they perceive as not-broken.
There is a small amount of wisdom in this philosophy, but like COBOL, mainframes/minis, and AS/400s/AIX, time will eventually pass them by, slowly, but unerringly, IMHO.