Major Oracle shops aren't dumping them for Mongo/Couchbase/... because they're trying to avoid SQL. They do it for scalability, availability, performance, flexibility and more.
I don't see that the facts in the real world back you up here.
Not claiming NoSQL is a panacea. You're definitely making some trade-offs, and in many cases it's just the wrong tech. But it's absurd to say it's happening to avoid a learning curve.