Classic and Core need to start collaborating, and give up a bit for the good of consensus. Perhaps Segwit released softfork in 1-2 months and than a 2-4 hardfork BIP later in 2016 with collaboration between all devs.
There will be no collaboration between Classic and Core - Core's objectives will never align with Classic. There was plenty of opportunity to reach agreement, but I think we are well past that now. The community will be offered an alternative to Core, with an alternative roadmap for segwit-like functionality, and it will be a free choice to run with it or run with Core.
Thats what bitcoin was always about. If you dont like what one product does, you can fork off to another.
Over 50% Mining behind Classic now, Its not looking good for Core.