I do not know Spring or your company/specialty. Of course it must be learnable and I won't tell you to give up on anything. Java is and will remain valuable.
Regardless, I don't think "lesser scope" is a valid strike against Node.js here. Node.js fulfills JavaScript's original vision of an everywhere language and can run anywhere that Java can. It serves webpages, communicates with hardware, powers command line tools, and builds desktop applications. A huge complexity-saver for teams running many environments (my biggest regret is that it cannot run a microcontroller).
Node.js' biggest practical weakness is that JavaScript is less structured than Java. Luckily, the large influx of Java developers has been helping with this: gaps like constants and private properties are gradually filling in, and TypeScript firms up the types to the point where JavaScript looks a lot like Java.
Probably more potential competition from the larger pool of JS developers, but the compensation is allegedly similar so I guess there is a similar supply/demand situation.