I am a dev, not a DBA. My observation of the DBA side of things is limited to the Microsoft cloud which encompasses Azure (or what was formerly known as Azure), Cosmos, Office 365 and few others. Thanks to Autopilot, each DBA can manage thousands of servers.

Are there fewer DBAs?

No - the Cloud now has over 100k servers and is growing fast. Autopilot allows DBAs to handle the growth, but so far as I know it did not make anybody redundant.