Looking at Modula-3 wikipedia page, no thanks. (If it's case-sensitive, I don't want to switch to uppercase everytime I use the language keywords. If it's not case-sensitive, don't even get me started.) I had enough of that for a lifetime through FORTRAN, COBOL, SQL, BASIC, ASSEMBLY, etc.
Do you have anything to say about it's feature set instead of just syntactic preference? As in, it's tradeoff in balancing complexity by what set of features?
Looking at it very briefly, its feature set is probably small enough to keep the language simple yet useful.
To be clear, I'm not a Rust guy, or even C++, Go, D.
On top of that, I'm a 2PL advocate (two programming languages). I think a combination of a readable high-level language like Python or Scheme, and a fast systems language like C, can carry out feats that no single programming language can as far as I know. (I don't consider keeping two or three programming language in your head while doing productive work a big deal, especially when learning multiple language is considered a beneficial thing).
PreScheme sounds like an interesting idea.