Yeah future computing hardware will be more diverse, but most of the things you mentioned are ultimately be programmed imperatively. GPGPUs are converging to look like many tiny general purpose CPUs, neural cores and accelerators are implemented as specialized coprocessors that accept commands from CPUs, distributed cloud compute is just farms of CPUs. All of these things have an imperative kernel, and importantly every one of them care very much about path dependencies, memory hierarchy, and ownership semantics, the very things that Rust brings to the table.

Even languages with 'exotic' execution semantics like prolog's Unification is actually implemented with an imperative interpeter like the Warren Abstract Machine/WAM, and there's not an obvious path to implementing such unorthodox semantics directly in hardware. Low-level imperative programs aren't going away, they're just being isolated into small kernels and we're building higher level abstractions on top of them.