Well everything has its place and purpose.
I donāt think you should replace your perfectly working MySQL databases with NoSQL.
Relational databases are still perfect for storing tabular data, specially that needs lots of manipulations or calculations like financial data.
However document based and NoSQL databases are on the rise because of their much better storage and query of document/ objects with their properties also json support.
And that is why you also get those hybride databases as all major database providers add document/ object support to their existing databases.
As the browsers are getting more and more interactive and advanced, people can create extensive rich client applications and the role of the server side is becoming more or less just the data delivery.
That is why cloud databases are on the rise now as well. You donāt need much but a good database to serve your needs.
On the other side there is also a great development of the blockchain technology, serverless decentralized peer 2 peer data technology. Which also has a great place and purpose.
So you just have to pick the right technology that suits your needs the best.
Wappler will support them all