It's like asking if the world should standardize on left handed or right handed screws as a default. There comes a point where the choice matters less than picking one at all.
But, like, even then, there's screw drive (JIS vs phillips vs pozidriv vs a ton more) to worry about with screws. (never mind the obvious aspects of diameter & length; and whatnot else I happen to not know about)
The significant thing I think is that such trivial impactless questions just do not exist for programming languages. Even like comment starting characters is a messy question - "//" nicely aligns with "/* */" using the slash char, but "#" is a char shorter and interpreted languages need to handle "#!" as a comment for shebangs anyways. And things only get more complicated from there.
And, unlike with physical things, it's trivial to work with non-standardized things in software. Not like you're gonna copy-paste arbitrary code from one language into another and just expect it's gonna work anyway (else we wouldn't have more than one language).
I also don't think syntax is even a problem worth worrying about. It takes very little time to become accustomed to a new syntax. It's the semantics that are hard to learn. Difficulty syntax can often be helpful when learning a new language, as it serves as a reminder that the semantics are different.