I don't see Johnson having too many problems with his Brexiters. Only Redwood and Paterson abstained. Most of them are like Neil Warnock and those blokes in Lincolnshire market vox pops- "Just want to get out, aren't we out yet?".
Cutting standards is unpopular, including among their new voters. A few battles here and there over fish is one thing. Being forever tied up in committees where the EU forces you to back down is quite another. I don't see Johnson's got any incentive to go there. And he can spaff his way out of gradual economic damage. There's still plenty of room for him to do rabble rousing shit on "culture" to keep the Kippers happy.