Having spent far too much of my life overthinking this, I will now share:
Lua hadn't really made it to North America by 1995; the go-to extension language at the time was Tcl or a Lisp dialect. (Perl was an option but not really suited to embedding, and Python was this new thing nobody used.)
Java was THE HYPE in 1994; JS has its syntax because management wanted that similarity.
So the obvious design for JS is OOP Lisp with C syntax. And that's what we got, only bad.
@foone having used both, they are remarkably similar from the 10000ft altitude. So, I think that universe would be mostly indistinguishable from the one we live in.
@foone I'm probably wrong, but I like to think that if they started by embedding Lua they would have just stopped there, instead of doing whatever JS is now.