Wasm is getting merged in and designed in a way that it is "drop in". As in, the standard libs are written to do WASI calls instead of libc (or whatever else) for standard I/O concerns.

This is represented in some languages better than others -- for many languages you just switch the "target" -- from x86_64-unknown-linux-gnu to wasm32-wasip2 (ex. Rust). Some things won't work, but most/many will (simple file access, etc), as they are covered under WASI[0]

That's not to say that nothing will change, because there are some technologies that cannot be simply ported, but the explicit goal is to not require porting.

[0]: https://github.com/WebAssembly/WASI/tree/main/wasip2