I'm a engineering manager in charge of hiring who writes production Blazor on the side.
I'm assuming you are asking this question because high-fidelity UI is not required for whatever you are building. If you need a fancy UI, then there is no question being in the JavaScript ecosystem is important.
Blazor is great that provides language and framework unity. You don't have to hire, train, and retain separate developers in the UI framework/JavaScript/Typescript world. The front-end worlds moves at such a rapid pace, not having to be in that world is valuable.
Backend inclined-C# developers have less interest in keeping up with the front-end JavaScript world. Boring technology in a familiar language is great for them.
Somehow people started using React before there were react devs so I don't understand the hiring issues. If you need to hire 100 developers then sure the framework matters, but if you hire few people a year then getting talented C# developers who would like to learn the newest tech from Microsoft should be easy.
I actually don't think Blazor is ready for a major project yet because the developer experience isn't great yet. The WebAssembly debugger is shoddy and the lack of hot reloading in both server and wa is demoralizing.