If the tools are still seriously lacking after several decades, that does point at a problem with the concept IMO. I don't think the core idea of a parser generator is an awful one, but I do think it's become clear that the classic lex/yacc approach is the wrong one, and while PEGs and things like Parsec as a good step in the right direction, I think another conceptual shift will be needed before they're unambiguously better than a handrolled parser.