No, I think we're honestly even more sold on protocol buffers' wire format than before.
That said, if I did want to go looking elsewhere, I think the main serialization format I am really interested in is Cap'n Proto: http://kentonv.github.io/capnproto/
That said, if I did want to go looking elsewhere, I think the main serialization format I am really interested in is Cap'n Proto: http://kentonv.github.io/capnproto/