SOME interactions between new and old clients POSSIBLE
What are you saying isn't possible? Did you suddenly lose functionality when CLTV was released?
but will be left passing the parcel of unknown content
No they won't-- but even if they were, why would that be bad?
95% consensus
95% of what? and where are you getting that figure from? The code in the Bitcoin classic repository doesn't appear to attempt to do that.
when 95% of people are happy
Oh, of people? How the heck do you intend to measure that? ... if we could measure that we likely wouldn't need the blockchain.