There would be way more language and tool development around more efficient languages because more people would be required to use them. So C and C++ would probably be in a totally different state. There would be a huge amount of hate for people who use some C++ derivative with a framework on top of it using some program that allowed it to easily run on multiple systems.

Good points. Somehow typing latency might actually be better, lol.

V8 might just invent like 3 more execution engines though, 1 of which uses an external TPU (open source though!) to run code JITed to HVM (Higher Order Virtual Machine) that everyone is eventually compelled to adopt, one can't be too sure JS will lose. /s