We'll see. I wouldn't be at all surprised if what @urban genie said is right, and Soubry etc have been giving the 'yes, yes, we'll leave too' to these 7, and then sit back and watch them flounder, but the Tory party are also getting to the point where a single direction of policy with regards to brexit is going to massively piss off a chunk of MPs, whatever that direction will be.
I wouldn't deny that it is a major issue, but there's no equivalent to the Corbyn problem in the Tories.