The numbers just aren't there for May's deal, so where does that leave us? Labour won't vote for it, the SNP won't vote for it, the ERG won't vote for it. If it doesn't pass, the EU won't renegotiate and we kind of just fall out in that regard.
I think Labour are as split, but they are letting the Govt rip itself apart. There has been talk of a Europhile party, but ultimately they'd be on the fringes with such a niche issue and those MPs would more than likely sink without a trace at the next election.
The only majority that seems to exist with regards Brexit is a majority against no deal and the amendment voted through last week (Dominic Grieves I think) means a no deal exit can be blocked (if I've read it correctly).
It is certainly an interesting time for the Tories with a genuine risk of a proper split. Plenty of MPs (40 iirc from the BBC) have said they would resign the whip if Boris or JRM became leader. The ERG/Eurosceptics will continue regardless and if anything have hardened their view whilst on the opponent side their views have hardened likewise. In the past the disagreements tended to be dealt with privately, now there it is all in the public. There seems little to no room for compromise between the factions.
Agree on Labour, they are apparently being deliberately quiet so the 2 wings of the Tories carry on tearing themselves apart.