Dunno, Paul. While SPJ does have a lot of relevance to current computing, his work is not a product like Etherpad was. I haven't seen YC companies moving towards or staying with fringe languages -- not that I criticize that business decision.

Maybe the YC model will reach that "how will we be computing in 10 years" phase at some point. But (perhaps with good reason?) it does not seem to be there yet.