I know all three, and I'm not seeing it dying any time soon. WebAssembly is not going anywhere, neither are dynamic back-end systems. I have drastically less issues with my front-end while using Blazor compared to just doing raw JavaScript. I've built everything from a PWA from scratch using Vanilla JS, to an iFrame Frenzy web app a client paid us top dollar to build.

Silverlight was proprietary, Blazor is MIT licensed and using open web technologies that are NOT going anywhere any time soon. We just had another major upgrade to Web Assembly's spec not that long ago.