Haskell (IMHO) won't ever be mainstream for much the same reasons Lisp never was (or will be?): it has an incredibly high learning curve (eg [1]). Bingo. Anybo

Haskell (IMHO) won't ever be mainstream for much the same reasons Lisp never was (or will be?): it has an incredibly high learning curve (eg [1]). Bingo. Anybody that thinks Haskell will ever escape its niche has not spent enough time working with rank & file programmers. That doesn't mean you shouldn't consider it or that it can't find a large enough niche to sustain itself but it does mean that it's unlikely to ever overcome what Carmack refers to as "externalities" for a lot of prospective users.