See whats been done there?
There is no space for any genuine EUout'er to show their face within the Conservative party - at least not until Cameron completes his renegotiation. But what then?
Cameron has said he will be supporting an 'in' vote regardless - he actually said following successful renegotiation, but he'd never admit his renegotiation has been unsuccessful, so it will be declared successful regardless of what it contains and he will back an in vote based on it...
At this point Conservative MP's will have a choice:
Either to back Cameron, close their eyes, cross their fingers and follow where ever Cameron leads them which will be a Cameron led government in or out of the EU.
Or they may chose to oppose Cameron - effectively saying they believe their leader, their elected Conservative Prime Minister is working against the best interests of the country! Whatever happens in the referendum, they will have no career under Cameron - and none in the Conservative party unless the vote was 'out' and one of their number replaced Cameron and followed this with an extensive night of the long knives against all pro-EU conservatives and supporters of Cameron...
The second option is not the Conservative way - anyone capable of such oppositon to the elected leader would have been weeded out well before being selected to run in the last general election.
This is why I believe Mark Reckless and Douglas Carswell left the Conservative party - they saw these were the options and realised no Conservative MP would be going against Cameron.
As long as Cameron is the leader of the Conservative party, all Conservative MP's are #EUin.